By this I mean like are they often sexual (probably seems like a no duh but I’ve never read through one since they are so long)

They are usually very sexual, and down horrendous, yes

Is it just like one giant orgy?

Feels like it sometimes

Makes when were more common, lot were pretty much like that. There really is no standard to them. Can have as much or as little plot as you like. Long as nothing in the thread it's self doesn't break the rules.