It's a space where everyone (or at least a critical mass of people) know the assignment, and aggressively seek out hedonistic debauchery. I think there's room for everyone (tops, bottoms, vers/switch, sides, voyeurs), but there are several oral and/or anal pig bottoms who are insatiably hungry, and dicks that know how to gag throats and pound holes. And once the first bottom gets on his knees, others start to follow suit, and by the end of the night everyone's mixed and matched and lots of piss and cum and sweat and musk has flooded all of the holes and either the bottoms have been broken and/or the tops have been fully drained. Typically, a lot of stoned and/or poppered pigs.
I've played my part in many such orgies, and I currently very much enjoy a monthly orgy that's full of different shapes, sizes, and attitudes of pigs that all know the rules, know how to have fun, and pig out.