I know what you're talking about. People my age are into stuff like that more when it comes to threesome. That's like the first thing that comes to their mind, but I don't see anything wrong with it if everyone is on the same page and it's all consensual. I've noticed it too, keep in mind I'm only 20. I've seen it as a common thing. I was invited one time to be in one, but I was not feeling well, because of drugs.
I highly suggest don't do one if you're on drugs or especially drinking preventing further drama and stupidity. I don't see having sex whatever way you want whether on whatever substance with people is bad, except when people are really stupid. I don't do drugs anymore, I drink sometimes when I'm with a group of my closest friends not at random parties, but one party I was at I had it offered. I was feeling sick from smoking too much weed back then and that wouldn't had been good. Interestingly enough, I was very turned on to the fact about that weird situation.

So I like it, for more possibilities in my perspective, but of course everyone has to be on the same page for it to be fun or else why do it?