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.
Sex with Dick, Jane, and Sally:
Threesome
Sex wirh Dick, Jane, Sally, and
Henry: Foresome
Sex with Dick, Jane, Sally,
Henry, and Susie: Orgy