Foursome (group sex)

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

[1][2] A gang bang involves three (or more) people having sex with a fourth successively.

Sexual intercourse involving multiple women in which one man is the central focus.

[4][5][6] 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.

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