when a bunch of people get together to trade STD's

A jack off buddy (from 'cum' /'come', meaning 'semen', and 'companion'); a friend that you get together with for sessions of solo or mutual masturbation
Variant of: cumpanion (from 'companion' & 'cum'); jack off buddy & wank bud & JO buddy
Similar to: fuck buddy

A group of more than four people having sex in the same area.

A gathering of four or more people who take their socks off.

Sex party involving many partners

Five or more consenting persons engaging sexual intercourse in the same place over the same period of time. Synonymous with group sex. Common props include drugs, alcohol, toys, etc. but are not neccesary.

Leader of the Market Place Discussion, Commander of BooterDown, and true heir to the throne.