
Sixty-nine or 69, also known by its French name soixante-neuf (69), is a group of sex positions in which two people align themselves so that each person's mouth is near the other's genitals, each simultaneously performing oral sex on the other. The participants are thus mutually inverted like the numerals 6 and 9 in the number 69, hence the name. This position can involve any combination of sexes.

Anal sex or anal intercourse is generally the insertion and thrusting of the erect penis into a person's anus, or anus and rectum, for sexual pleasure. Other forms of anal sex include fingering, the use of sex toys for anal penetration, oral sex performed on the anus (anilingus), and pegging. Although anal sex most commonly means penile–anal penetration, sources sometimes use anal intercourse to exclusively denote penile–anal penetration, and anal sex to denote any form of anal sexual activity, especially between pairings as opposed to anal masturbation.

Anilingus is the oral and anal sex act in which a person stimulates the anus of another by using the mouth, including lips, tongue, or teeth. It is also called anal–oral contact and anal–oral sex, and is additionally known by slang names.

Autofellatio is the act of oral stimulation of one's own penis as a form of masturbation. Only a limited number of males are physically capable of performing autofellatio.

Woman on top is any sex position in which the woman is on top of her sexual partner during sexual activity. The position most commonly associated with the woman on top is often called the cowgirl or riding position, which derives its name from the image of the woman "riding" the man as a cowgirl rides a bucking horse. In that position, a man typically lies on his back with his legs closed, while the female partner straddles him, usually in a kneeling position facing either forward or back, and either the man or woman inserts the man's erect penis into the woman's vagina or anus. The cowgirl position is commonly cited as one of the more popular sex positions, especially by women, because it gives them control over the rhythm and pace of vaginal stimulation and the extent and duration of penetration and because of its ability to adequately stimulate the clitoris. There are other positions in which the woman may be on top, including the 69 position and the pompoir sex position.

Creampie is a sexual act, commonly featured in pornography, in which a male ejaculates inside his partner's vagina or anus without use of a condom, resulting in visible seeping or dripping of semen from the vagina or anus.

Cunnilingus is an oral sex act performed by a person on the vulva or vagina of another person. The clitoris is the most sexually sensitive part of the human female genitalia, and its stimulation may result in a woman becoming sexually aroused or achieving orgasm.

Doggy style is a sex position in which a person bends over, crouches on all fours, or lies on their abdomen, for sexual intercourse, other forms of sexual penetration or other sexual activity. Doggy style is a form of a rear-entry position, others being with the receiving partner lying on the side in the spoons sex position or the reverse cowgirl sex position. Non-penetrative sex in this position may also be regarded as doggy style.

Facesitting, also known as queening or kinging, is a sexual practice in which one partner sits on or over the other's face, typically to allow or force oral–genital or oral–anal contact. In addition to oral-genital and oral-anal contact, the position also leaves the bottom partner's hands free to stimulate other erogenous zones. The top partner may be facing either direction in this position. It is common for this position to form part of BDSM, involving dominance and submission, though this need not be the case. Within a BDSM or D/s context, facesitting can be a form of erotic humiliation.

Fellatio is an oral sex act involving a person stimulating the penis of another person by using the mouth, throat, or both. Oral stimulation of the scrotum may also be termed fellatio, or colloquially as teabagging. If fellatio is performed on oneself, the act is called autofellatio.

Fisting, handballing, fist-fucking, brachiovaginal, or brachioproctic insertion is a sexual activity that involves inserting a hand into the vagina or rectum. Once insertion is complete, the fingers are either clenched into a fist or kept straight. Fisting may be performed without a partner, but it is most often a partnered activity.

Doggy style is a sex position in which a person bends over, crouches on all fours, or lies on their abdomen, for sexual intercourse, other forms of sexual penetration or other sexual activity. Doggy style is a form of a rear-entry position, others being with the receiving partner lying on the side in the spoons sex position or the reverse cowgirl sex position. Non-penetrative sex in this position may also be regarded as doggy style.

Frot is a non-penetrative form of male-to-male sexual activity that usually involves direct penis-to-penis contact. The term was popularized by gay male activists who disparaged the practice of anal sex, but has since evolved to encompass a variety of preferences for the act, which may or may not imply particular attitudes towards other sexual activities. Owing to its non-penetrative character, frot has the safe sex advantage of minimizing the transmission risk for HIV/AIDS; however, it still carries the risk of skin-to-skin sexually transmitted infections, such as HPV and pubic lice (crabs), both of which can be transmitted even when lesions are not visible.

Gay sexual practices are sexual activities involving men who have sex with men (MSM), regardless of their sexual orientation or sexual identity. Evidence shows that sex between men is significantly underreported in surveys due to social desirability bias.

The Guide To Getting It On! is a sexuality guide by research psychoanalyst Paul Joannides, illustrated by the comic book artist Dærick Gröss Sr. A 9th edition was released in 2017.

A handjob is a sex act, performed as either foreplay or as non-penetrative sex, that involves the manual stimulation of a man's penis or scrotum by another person to induce an erection for sexual pleasure, sexual arousal and sometimes resulting in orgasm and ejaculation.

Intercrural sex, also known as femoral/interfemoral sex, is a type of non-penetrative sex, where the penis is placed between the receiving partner's thighs and thrusts to create friction.

The Joy of Sex is a 1972 illustrated sex manual by British author Alex Comfort. An updated edition was released in September 2008.

The lateral coital position is a sex position described by Masters and Johnson in their Human Sexual Response. The position was preferred by 75% of their heterosexual respondents once they had tried it.

In zoology, copulation is animal sexual behavior in which a male introduces sperm into the female's body, especially directly into her reproductive tract. This is an aspect of mating. Many animals that live in water use external fertilization, whereas internal fertilization may have developed from a need to maintain gametes in a liquid medium in the Late Ordovician epoch. Internal fertilization with many vertebrates occurs via cloacal copulation, known as cloacal kiss, while mammals copulate vaginally, and many basal vertebrates reproduce sexually with external fertilization.

Lordosis behavior, also known as mammalian lordosis or presenting, is the naturally occurring body posture for sexual receptivity to copulation present in most mammals including rodents, elephants, and cats. The primary characteristics of the behavior are a lowering of the forelimbs but with the rear limbs extended and hips raised, ventral arching of the spine and a raising, or sideward displacement, of the tail. During lordosis, the spine curves dorsoventrally so that its apex points towards the abdomen.

Mammary intercourse is a sex act, performed as either foreplay or as non-penetrative sex, that involves the stimulation of a man's penis by a woman's breasts and vice versa. It involves placing the penis between a woman's breasts and moving the penis up and down to simulate sexual penetration and to create sexual pleasure. It may be used as an alternative to a handjob.

The missionary position or man-on-top position is a sex position in which, generally, a woman lies on her back and a man lies on top of her while they face each other and engage in vaginal intercourse. The position may also be used for other sexual activity, such as anal sex. It is commonly associated with heterosexual sexual activity, but is also used by same-sex couples.

Non-penetrative sex or outercourse is sexual activity that usually does not include sexual penetration. It generally excludes the penetrative aspects of vaginal, anal, or oral sexual activity, but includes various forms of sexual and non-sexual activity, such as frottage, mutual masturbation, kissing, or cuddling. Some forms of non-penetrative sex, particularly when termed outercourse, include penetrative aspects, such as penetration that may result from forms of fingering or oral sex.

Oral sex, sometimes referred to as oral intercourse, is sexual activity involving the stimulation of the genitalia of a person by another person using the mouth and the throat. Cunnilingus is oral sex performed on the vulva or vagina, while fellatio is oral sex performed on the penis. Anilingus, another form of oral sex, is oral stimulation of the anus. Oral stimulation of other parts of the body, such as by kissing or licking, is not considered oral sex.

Rusty trombone is an act in which a man stands with his knees and back slightly torqued with feet at least shoulder width apart to expose his anus. A person typically kneels behind the man and performs anilingus while reaching up beneath the testicles or around the body to manually administer rapid up and down motions of the penis, mimicking the motions of a trombone player. The act is defined primarily by the physical orientation of the partners, the combination of anilingus with manual sexual stimulation and the resemblance of the anal sphincter to a trombone mouthpiece; however, other positions and variations are possible.

The spoons position or spooning is both a sexual position and a cuddling technique. The name derives from the way that two spoons may be positioned side by side, with bowls aligned. The sexual spoons position is a form of a rear-entry position, the other being the doggy style position. The spoons sex position has been called one of the "basic four" sex positions.

The spread eagle is the position in which a person has their arms outstretched and legs apart, figuratively resembling an eagle with wings spread. It is a style that appears commonly in nature and geometry. In human style it is represented by the letter "X".

In human sexuality, a threesome is any sexual activity that involves three people at the same time. Though threesome is most commonly applied to a casual sexual activity involving sexual activity among three participants, a threesome may also be found in a long-term domestic relationship, such as polyamory or a ménage à trois.

Tribadism or tribbing, commonly known by its scissoring position, is a lesbian sexual practice in which a woman rubs her vulva against her partner's body for sexual stimulation, especially for stimulation of the clitoris. This may involve vulva-to-vulva contact or rubbing the vulva against the partner's thigh, stomach, buttocks, arm, or other body part. A variety of sex positions are practiced, including the missionary position.

Woman on top is any sex position in which the woman is on top of her sexual partner during sexual activity. The position most commonly associated with the woman on top is often called the cowgirl or riding position, which derives its name from the image of the woman "riding" the man as a cowgirl rides a bucking horse. In that position, a man typically lies on his back with his legs closed, while the female partner straddles him, usually in a kneeling position facing either forward or back, and either the man or woman inserts the man's erect penis into the woman's vagina or anus. The cowgirl position is commonly cited as one of the more popular sex positions, especially by women, because it gives them control over the rhythm and pace of vaginal stimulation and the extent and duration of penetration and because of its ability to adequately stimulate the clitoris. There are other positions in which the woman may be on top, including the 69 position and the pompoir sex position.