I've done a couple of those before, and I think what's really interesting about them is the decreased levels of inhibition had by ALL. Most recently, I hooked up with a couple on some sort of uncertain establishment -- I think they're just fuckbuddies. We got started on a lot of vodka tonics at a club here in town, and then we went back to her place (which was only a block or so from mine), drank some more, put on some reggae, and clothes started coming off. I think they were in a mood to get frisky, and hands started tugging at my shirt.
The bulk of what I did was going down on her, and she tasted and smelled GREAT! (Yeah, njqt, that's why I like cunnilingus especially with a well-maintained chick.) I stayed down there for a while. With all the alcohol, I unfortunately couldn't sustain an erection, but the times that the soldier was in salute, both of them must have grabbed for it. We also all made out with each other and did a lot of bod contact.
Funny thing is, the dude, he's already a fellow Ph.D. student in my program. Oh well. I vaguely recall saying something about it and that he just shot me a smile.