A foursome is a form of group sex

Group sex

Group sex is sexual behavior involving more than two participants. Group sex can occur amongst people of all sexual orientations and genders...

 involving four people of any gender combination.

Types of foursomes

The level of sexual activity among the four members may vary greatly. Other foursomes may involve some same sex contact, and some foursomes actively involve all four members.

Wife Swapping

Wife swapping involves two couples, usually both married heterosexual pairs, where each man swaps his wife for the other, and has sexual intercourse with her. There is usually no sexual contact between the two wives or the two husbands. Although this act is named for married couples, it applies equally to unmarried and homosexual couples.

Soft Swinging

Soft swinging involves two couples, where either one couple has a voyeuristic

Voyeurism

In clinical psychology, voyeurism is the sexual interest in or practice of spying on people engaged in intimate behaviors, such as undressing, sexual activity, or other activity usually considered to be of a private nature....

 role watching the other have sex, or the couples each have sex but with no sexual contact between the two pairs.

Gangbangs

A gang bang involves three (or more) people having sex with a fourth successively. This usually occurs with men penetrating women, but can equally apply to homosexual acts, or women penetrating men using Strap-on dildo

Strap-on dildo

A strap-on dildo is a dildo designed to be worn, usually with a harness, during sexual activity. Harnesses and dildos are made in a wide variety of styles, with variations in how the harness fits the wearer, how the dildo attaches to the harness, as well as various features intended to facilitate...

s.

Airtight seal

The airtight seal involves vaginal sex

Sexual intercourse

Sexual intercourse, also known as copulation or coitus, commonly refers to the act in which a male's penis enters a female's vagina for the purposes of sexual pleasure or reproduction. The entities may be of opposite sexes, or they may be hermaphroditic, as is the case with snails...

 and anal sex

Anal sex

Anal sex is the sex act in which the penis is inserted into the anus of a sexual partner. The term can also include other sexual acts involving the anus, including pegging, anilingus , fingering, and object insertion.Common misconception describes anal sex as practiced almost exclusively by gay men...

 performed on a woman by two men in a double penetration, while the woman performs fellatio

Fellatio

Fellatio is an act of oral stimulation of a male's penis by a sexual partner. It involves the stimulation of the penis by the use of the mouth, tongue, or throat. The person who performs fellatio can be referred to as the giving partner, and the other person is the receiving partner...

 on a third man.

Quads

A quad is a romantic relationship

Romantic love

Romance is the pleasurable feeling of excitement and mystery associated with love.In the context of romantic love relationships, romance usually implies an expression of one's love, or one's deep emotional desires to connect with another person....

 involving four people. It is most commonly used to describe a love relationship between two couples where it takes the form of a square

Square (geometry)

In geometry, a square is a regular quadrilateral. This means that it has four equal sides and four equal angles...

, in which all four people have a love relationship with each other.

While it can refer to two people independently romantically linked with two others, it usually implies that each of the four people has some kind of sexual relationship to the other three. The relationships are normally friendships, though romantic. Addition of bisexual

Bisexuality

Bisexuality is sexual behavior or an orientation involving physical or romantic attraction to both males and females, especially with regard to men and women. It is one of the three main classifications of sexual orientation, along with a heterosexual and a homosexual orientation, all a part of the...

 or homosexual characters adds many possible combinations of sexes, and of romantic and sexual interactions.

External links

• Relationship Types: Foursomes