GangBang

GangBang, sometimes Gang Bang, is a specific kind of orgy, where a number of people (the Gang)  are performing sex acts (Bang) on one person, either in turn or at the same time. Being the center of attention in a groupsex orgy is an extremely common fantasy among both men and women, and has become a subgenre in pornographic fims.
Many BDSM videos spice up the GangBang with moments of Domination and Submission, telling stories of innocent girls that are brutally fucked and double-penetrated by a bunch of bad guys.

PublicDisgrace, part of the Kink network, filmed many GangBangs in the public space, combining rough group sex with voyeurism and humilation.
A special bang, of Asian origin, is called Bukkake, where the gangbanged girl is glazed with sperm in the end, because all the guys ejaculate on her face.