Group sex is sexual behaviour involving more than two people at the same time.

Any sexual behaviour performed by two people can be a part of group sex, as well as a number of behaviors only possible with more than two people. Group sex involving a single female or male and multiple males is sometimes termed a gang bang.

The same safe sex considerations that apply to one-on-one sex apply to group sex, for the same reasons. People who have group sex may have higher numbers of sexual partners, and may for this reason be more likely to have sexually transmitted infections (STIs) or to be at risk for STIs than those who have fewer sexual partners.

Group sex occurs amongst people of all sexual orientations, but may or may not involve homosexual, bisexual or heterosexual contact, though sex involving three or more people must necessarily involve multiple members of the same sex.

A list of possible group sex positions.

• spitroast or roasting the penetration of one person in the mouth at the same time as they are being penetrated in the vagina or anus. Sometimes called a wobbly H or (Chinese) fingercuffs, since the person in the middle is stuck between. (See also: Chasing Amy.)
• Double penetration The simultaneous penetration of a woman’s vagina and anus. Sometimes called a sandwich.
• Airtight seal the simultaneous penetration of a woman’s vagina, anus and mouth.
• Double vaginal penetration the simultaneous penetration by two men of a single woman’s vagina.
• Double anal penetration the simultaneous penetration by two men of a single woman’s or man’s anus.
• Double vaginal, double anal, DVDA the simultaneous penetration by two men of a single woman’s vagina coupled with the simultaneous penetration by two men of the same woman’s anus. There is no evidence that a DVDA has ever been accomplished as it is in all likelihood physically impossible.
• Daisy chain a group of men simultaneously penetrating and being penetrated by each other anally in a circular chain formation; a group of men, women, or both, each performing oral sex on the next.
• Isosceles Lock in which three men perform fellatio in a triangular configuration.
• Lucky Pierre in which a man has vaginal sex with a woman, whilst himself being anally penetrated by another man—term can also be used for similar all male activities.
• Napoleon’s Hat in which a man vaginally penetrates one woman while orally performing upon a second woman. The two women engage in sexplay from the waist up.

These acts may also be performed by women wearing strap-on dildos!