Intercourse involving insertion of the penis into the rectum.

Contact between the tongue of one person and the anus of another.

The opening located at the back of the top of the legs that serves as an exit for solid waste from the digestive system. Unless it has been cleaned thoroughly it typically has some amount of fecal matter and bacteria in it.

Bondage, discipline, sadism, and masochism are consensual role-playing behaviours engaged in for sexual arousal. There is a wide spectrum of activities involved, and actual sexual intercourse may or may not be included. Typically, one person in the interaction is more dominant and the other is more submissive. Infliction of pain, within limits, is a frequent factor, as are verbal abuse and other activities manifesting dominance of one person and submission of the other. Often, implements and clothing made with leather, metal, and/or plastic are used.

Bondage, discipline, sadism, and masochism are consensual role-playing behaviours engaged in for sexual arousal. There is a wide spectrum of activities involved, and actual sexual intercourse may or may not be included. Typically, one person in the interaction is more dominant and the other is more submissive. Infliction of pain, within limits, is a frequent factor, as are verbal abuse and other activities manifesting dominance of one person and submission of the other. Often, implements and clothing made with leather, metal, and/or plastic are used.

Contact between the mouth of one person and the genitalia of another. See fellatio (oral sex on a male) and cunnilingus (oral sex on a female).

Bondage, discipline, sadism, and masochism are consensual role-playing behaviours engaged in for sexual arousal. There is a wide spectrum of activities involved, and actual sexual intercourse may or may not be included. Typically, one person in the interaction is more dominant and the other is more submissive. Infliction of pain, within limits, is a frequent factor, as are verbal abuse and other activities manifesting dominance of one person and submission of the other. Often, implements and clothing made with leather, metal, and/or plastic are used.

Bondage, discipline, sadism, and masochism are consensual role-playing behaviours engaged in for sexual arousal. There is a wide spectrum of activities involved, and actual sexual intercourse may or may not be included. Typically, one person in the interaction is more dominant and the other is more submissive. Infliction of pain, within limits, is a frequent factor, as are verbal abuse and other activities manifesting dominance of one person and submission of the other. Often, implements and clothing made with leather, metal, and/or plastic are used.

The fleshy areas on either side of the breastbone (sternum) on the upper front of the body. Each breast has a nipple in or near the centre of it. During puberty, female breasts typically become rounder and fuller. They have glands in them that, after childbirth, produce milk that can be fed to an infant through the nipples. The nipples on male breasts do not have any function of this sort. Breasts, like other body parts, can be focuses of sexual stimulation, and in societies where they are normally concealed, they are often objects of sexual arousal. However, breasts are not involved in sexual reproduction and are not genitalia.

In males, the surgical removal of the foreskin from the tip of the penis, usually done during infancy. It is done for various reasons, including religious beliefs, traditions, and concerns regarding hygiene. In females, circumcision is uncommon but persists in some cultures. It involves partial or total removal of the clitoris and sometimes other parts of the external female genitalia. It is often referred to as female genital mutilation (FGM).

A sensation of intense physical excitation and pleasure typically lasting a few seconds, usually centring on the genitals but often involving the rest of the body. In males, orgasm is typically accompanied by ejaculation, and there may be a period of time (lasting minutes or hours) before the male is able to perform sexually and experience orgasm again. In females, orgasm may sometimes be repeated within a short period of time. Orgasm for males typically involves stimulation of the penis, although other sources of sexual arousal may lead to orgasm. Orgasm in females may involve stimulation of the vagina, clitoris, or both, or may be stimulated by other sources of arousal. Orgasms rarely happen simultaneously for sexual partners, and sexual intercourse is sometimes concluded after the male has had an orgasm but before the female has.

A nodule of flesh rich in nerve fibers, small but varying in size, located in front of the opening of a vagina but between the labia and above the urethra. Stimulation of it can produce sexual pleasure and may lead to orgasm.

Mutual sexual stimulation between a male and a female involving the insertion of the penis into the vagina.

Mutual sexual stimulation between a male and a female involving the insertion of the penis into the vagina.

A clear fluid that may be emitted in small amounts from the tip of the penis when aroused, before ejaculation and not normally containing significant quantities of sperm.

Sexually motivated contact between the tongue of one person and the vaginal area of another.

Electronic communication between distant persons for the purpose of sexual stimulation. Persons involved may masturbate individually while communicating, and may describe actual or fantasized sexual acts performed on each other.

An openmouthed kiss involving the touching of both persons' tongues.

An electronic device designed for the stimulation of female genitalia (clitoris and/or vagina). It is often cone- or penis-shaped.

Bondage, discipline, sadism, and masochism are consensual role-playing behaviours engaged in for sexual arousal. There is a wide spectrum of activities involved, and actual sexual intercourse may or may not be included. Typically, one person in the interaction is more dominant and the other is more submissive. Infliction of pain, within limits, is a frequent factor, as is verbal abuse and other activities manifesting dominance of one person and submission of the other. Often, implements and clothing made with leather, metal, and/or plastic are used.

Bondage, discipline, sadism, and masochism are consensual role-playing behaviours engaged in for sexual arousal. There is a wide spectrum of activities involved, and actual sexual intercourse may or may not be included. Typically, one person in the interaction is more dominant and the other is more submissive. Infliction of pain, within limits, is a frequent factor, as are verbal abuse and other activities manifesting dominance of one person and submission of the other. Often, implements and clothing made with leather, metal, and/or plastic are used.

Rinsing out the vagina with a fluid.

Emission of semen from the penis, usually in several forceful spurts, although the quantity and velocity vary considerably. Ejaculation typically occurs at the time of orgasm, although it may occur without a sensation of orgasm, and a sensation of orgasm may occur without ejaculation.

Rinsing out the large intestine with fluid.

A state of the penis when, due to stimulation, it has filled certain special tissues in it with blood, causing it to enlarge and become firm. Sexual intercourse is difficult without erection, but ejaculation can happen without it.

Stimulation of the penis using the mouth (including lips and tongue).

Focus of sexual arousal on a body part (e.g., feet), object (e.g., leather), or situation (e.g., household cleaning) not conventionally viewed as sexual.

Use of the finger or fingers to stimulate the clitoris and/or vagina.

Any of a variety of activities taking place before sexual intercourse with the aim of increasing arousal and readiness for intercourse. Foreplay may include kissing, touching or stoking various parts of the body, verbal communication, and any other means of increasing readiness for sexual intercourse.

A sheath of skin surrounding the tip of the penis. When the penis is erect, it extends so that it is not sheathed by the foreskin. The foreskin is sometimes removed by circumcision.

An openmouthed kiss involving the touching of both persons' tongues.

The sexual organs: in males, the penis and scrotum; in females, the labia, clitoris, and vagina.

An area thought by some to be located on the front wall of the vagina. Stimulating it is thought to increase sexual arousal and experience of orgasm. Its existence and nature remain subject to debate.

An area thought by some to be located on the front wall of the vagina. Stimulating it is thought to increase sexual arousal and experience of orgasm. Its existence and nature remain subject to debate.

Use of the hand to stimulate another person's penis.

The opening of the vagina is flanked by two flaps of skin on each side, forming an opening that runs from the front towards the back. The outer flaps, which are larger, are the labia majora; the inner flaps are the labia minora.

The opening of the vagina is flanked by two flaps of skin on each side, forming an opening that runs from the front towards the back. The outer flaps, which are larger, are the labia majora; the inner flaps are the labia minora.

The opening of the vagina is flanked by two flaps of skin on each side, forming an opening that runs from the front towards the back. The outer flaps, which are larger, are the labia majora; the inner flaps are the labia minora.

A term used to refer to a wide variety of activities ranging from kissing to all varieties of sexual intercourse. In current usage, it frequently refers to French kissing and physical contact not including penetration.

Bondage, discipline, sadism, and masochism are consensual role-playing behaviours engaged in for sexual arousal. There is a wide spectrum of activities involved, and actual sexual intercourse may or may not be included. Typically, one person in the interaction is more dominant and the other is more submissive. Infliction of pain, within limits, is a frequent factor, as are verbal abuse and other activities manifesting dominance of one person and submission of the other. Often, implements and clothing made with leather, metal, and/or plastic are used.

Use of the hand and/or external accessories to stimulate one's own genitals. Some of the terms used may refer to this activity by males or females; some (jerking off, jacking off, choking the chicken, slapping the monkey, spanking the monkey, beating off, whacking off) refer to self-stimulation of the penis; some (flicking the bean, jilling off, diddling the skittle, double-clicking the mouse) refer to self-stimulation of the clitoris.

Sexual intercourse involving three persons. It may involve any combination of males and females and may involve a wide variety of sexual activities.

A position for sexual intercourse in which the female is lying on her back and the male is on top of her. It is called the "missionary position" because it was reputed to have been taught by missionaries as the only morally proper position for sexual intercourse.

Use of the hands by two or more persons to stimulate each other sexually.

Contact between the mouth of one person and the genitalia of another. See fellatio (oral sex on a male) and cunnilingus (oral sex on a female).

Sexually motivated contact between the tongue of one person and the vaginal area of another.

Stimulation of the penis using the mouth (including lips and tongue).

A sensation of intense physical excitation and pleasure typically lasting a few seconds, usually centring on the genitals but often involving the rest of the body. In males, orgasm is typically accompanied by ejaculation, and there may be a period of time (lasting minutes or hours) before the male is able to perform sexually and experience orgasm again. In females, orgasm may sometimes be repeated within a short period of time. Orgasm for males typically involves stimulation of the penis, although other sources of sexual arousal may lead to orgasm. Orgasm in females may involve stimulation of the vagina, clitoris, or both, or may be stimulated by other sources of arousal. Orgasms rarely happen simultaneously for sexual partners, and sexual intercourse is sometimes concluded after the male has had an orgasm but before the female has.

A gathering of several people for the purpose of sexual activities.

Sexual activity that does not involve vaginal, anal, or oral penetration, and typically includes stimulation of the genitalia. Some examples include, petting in the genital area, massaging, kissing, hugging, etc.

The primary male sexual organ. It is similar in shape to a finger but is typically thicker and may be longer, and it has a larger "head" at the tip that is the main location for sexual stimulation. It has one opening in the tip, the urethra. The urethra is used for urination and for ejaculation. Penises have a sheath of skin around the tip, the foreskin, that may be removed by circumcision. The penis normally hangs limp, but when it is stimulated special blood vessels in it fill and cause it to enlarge and become rigid.

The area around the anus.

The area between the legs behind the genitalia and in front of the anus.

Electronic communication between distant persons for the purpose of sexual stimulation. Persons involved may masturbate individually while communicating, and may describe actual or fantasized sexual acts performed on each other.

A clear fluid that may be emitted in small amounts from the tip of the penis when aroused, before ejaculation and not normally containing significant quantities of sperm.

A clear fluid that may be emitted in small amounts from the tip of the penis when aroused, before ejaculation and not normally containing significant quantities of sperm.

A clear fluid that may be emitted in small amounts from the tip of the penis when aroused, before ejaculation and not normally containing significant quantities of sperm.

A sheath of skin surrounding the tip of the penis. When the penis is erect, it extends so that it is not sheathed by the foreskin. The foreskin is sometimes removed by circumcision.

Sexual intercourse where one of the people involved is not a willing participant or is not considered to have had discretionary ability in choosing to participate.

It is the last section of the large intestine, ending at the anus. Unless it has been cleaned thoroughly it typically has some amount of fecal matter and bacteria in it.

Bondage, discipline, sadism, and masochism are consensual role-playing behaviours engaged in for sexual arousal. There is a wide spectrum of activities involved, and actual sexual intercourse may or may not be included. Typically, one person in the interaction is more dominant and the other is more submissive. Infliction of pain, within limits, is a frequent factor, as are verbal abuse and other activities manifesting dominance of one person and submission of the other. Often, implements and clothing made with leather, metal, and/or plastic are used.

Bondage, discipline, sadism, and masochism are consensual role-playing behaviours engaged in for sexual arousal. There is a wide spectrum of activities involved, and actual sexual intercourse may or may not be included. Typically, one person in the interaction is more dominant and the other is more submissive. Infliction of pain, within limits, is a frequent factor, as are verbal abuse and other activities manifesting dominance of one person and submission of the other. Often, implements and clothing made with leather, metal, and/or plastic are used..

Bondage, discipline, sadism, and masochism are consensual role-playing behaviours engaged in for sexual arousal. There is a wide spectrum of activities involved, and actual sexual intercourse may or may not be included. Typically, one person in the interaction is more dominant and the other is more submissive. Infliction of pain, within limits, is a frequent factor, as are verbal abuse and other activities manifesting dominance of one person and submission of the other. Often, implements and clothing made with leather, metal, and/or plastic are used.

A wrinkly bag of skin hanging below the penis and containing the testicles.

A white fluid containing sperm that is emitted from the penis, usually at the time of orgasm. The sperm in it may remain alive for up to 3 days after emission.

A clear fluid that may be emitted in small amounts from the tip of the penis when aroused, before ejaculation and not normally containing significant quantities of sperm.

Electronic communication between distant persons for the purpose of sexual stimulation. Persons involved may masturbate individually while communicating, and may describe actual or fantasized sexual acts performed on each other.

Focus of sexual arousal on a body part (e.g., feet), object (e.g., leather), or situation (e.g., household cleaning) not conventionally viewed as sexual.

An infection spread between persons through sexual contact. Common sexually transmitted infections include viral ones such as herpes and human papilloma virus, bacterial ones such as gonorrhea and chlamydia, and fungal ones such as candida.

An infection spread between persons through sexual contact. Common sexually transmitted infections include viral ones such as herpes and human papilloma virus, bacterial ones such as gonorrhea and chlamydia, and fungal ones such as candida.

Mutual oral sex performed by two people on each other simultaneously.

Intercourse involving insertion of the penis into the rectum.

An infection spread between persons through sexual contact. Common sexually transmitted infections include viral ones such as herpes and human papilloma virus, bacterial ones such as gonorrhea and chlamydia, and fungal ones such as candida.

An infection spread between persons through sexual contact. Common sexually transmitted infections include viral ones such as herpes and human papilloma virus, bacterial ones such as gonorrhea and chlamydia, and fungal ones such as candida.

Two organs located in the scrotum, which hangs below the penis. The testicles are approximately the size and shape of peach pits or small nuts. They are somewhat firm but are highly sensitive to moderate or strong pressure. The testicles produce sperm, which is used for fertilizing ova (eggs) in human reproduction.

Two organs located in the scrotum, which hangs below the penis. The testicles are approximately the size and shape of peach pits or small nuts. They are somewhat firm but are highly sensitive to moderate or strong pressure. The testicles produce sperm, which is used for fertilizing ova (eggs) in human reproduction.

Sexual intercourse involving three persons. It may involve any combination of males and females and may involve a wide variety of sexual activities.

Sexual intercourse involving three persons. It may involve any combination of males and females and may involve a wide variety of sexual activities.

Mutual sexual stimulation between two females by rubbing the vaginas and clitorises together.

Sexually motivated behaviour focusing on, and gaining arousal from, urine. This includes a variety of activities and forms of contact.

A central part of the female genitals. It is a narrow muscular canal with an external opening surrounded by the vulva. It is lined with mucus membrane, making it slippery and sensitive. It ends at the cervix, which is a narrow passage leading into the uterus.

Rinsing out the vagina with a fluid.

Mutual sexual stimulation between a male and a female involving the insertion of the penis into the vagina.

An infection spread between persons through sexual contact. Common sexually transmitted infections include viral ones such as herpes and human papilloma virus, bacterial ones such as gonorrhea and chlamydia, and fungal ones such as candida.

An infection spread between persons through sexual contact. Common sexually transmitted infections include viral ones such as herpes and human papilloma virus, bacterial ones such as gonorrhea and chlamydia, and fungal ones such as candida.

An electronic device designed for the stimulation of female genitalia (clitoris and/or vagina). It is often designed to mimic an erect penis in appearance.

Electronic communication between distant persons for the purpose of sexual stimulation. Persons involved may masturbate individually while communicating, and may describe actual or fantasized sexual acts performed on each other.

The external female genitalia, including the labia and clitoris.