Foursome

A foursome is a form of group sex involving four people of any gender combination.

Types of foursomes
The level of sexual activivty among the four meners may very greatly. Other foursomes may involve some smae sex contact, and some foursomes actively involve all four members.

Wife Swapping
Wife swapping involves two couples, usallyboth married heterosexual pairs, where each amn swaps his wife for the other, and has sexual intercourse with her. There is usally no sexual cotnact between the two wives  or the two husbands. Although this act is named for married cuples,it applies equally to unmarried and homosexual couples. Wife swapping is sometimes simply called "swapping" as some poeple find the term "wife swapping" degrading to women and implies treating them as objects.

Soft Swinging
Soft Swinging involves twocouples, where either one couple has a voyeuristic role watching the toher have sex, or the couples each ahve sex but with n sexual contact between the two pairs.

Gangbangs
A Gang bang involves three (or more) people haing sex with a fourth successively. This usally occurs with men penetrating wome, but can equally apply to homosexual acts,or women penetrating men using Strap-on didlos.

Airtight seal
The airtight seal involves vaginal sex and anal sex performed on a woman by two men in a double penetration, while the woman performs fellatio on a third man.

Quads
A quad is a romantic relationship involving four people. it is most commonly used to describe a love relationship between two couples where it takes the form of a square, in which all four people have a love relationship each other.

While it can refer to ttwo people indepenfently romantically linked with two others, ir usally implies that each of the four people has some king of sexual relationship to the other three. The relationships are normally friendshi^psn though romantic. Addictionof bisexual orhomosexual characters adds amny possible combinations of sexes, and of romantic and sexual interactions.