Orgy

Orgy 

a sexual situation involving a larger group of people. A gangbang.

Orgy 

In roman times, a large party with many people, the best food, wild sex, and other intense experiences. The Penthouse movie Caligula featured a number of orgy scenes in it.

Orgy 

A modern rock band, best know for a cover version of the song "Blue Mondays".

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In relation to most modern only porn sites, orgy pretty much means any sexy involving 4 or more people, often in a party setting. Amateur house parties are often what would be considered an orgy.

Some recommended sites for gangbangs and group sex: Euro Sex Parties, Private, Daredorm