Mike had met me for lunch (he sometimes pops along to Uni) and we were sitting chatting and overheard a couple of girls talking about getting off with people at a party. It was difficult to hear too much as they were talking fairly quietly and giggling to each other and the cafe was fairly noisy. Fortunatly, Mike has fairly good hearing and relayed a fair amount of what they said to me (well, enough for us to make sense of the conversation anyway).
From what we could gather, the party was a fairly wild one (by the standards of the ones I go to anyway) and many people had ended up getting off with each other throughout the night (that bit isn't so bad, given it's how I met Jen!). However, it seems that by the end of the evening, some of these couples were semi naked and making out while still surrounded by people. We didn't catch a lot of the names, but someone who sounded like Anastasia got off with someone who fingered her on the sofa in full view of everyone (I don't think they saw her pussy, just the guy's hand up her skirt and it was fairly clear what they were doing).
I'm not quite ready to try this sort of thing in front of my friends, but we're hoping to try to get to know some of the people from this group and go to some of their parties - if they are always as fun as this one, we might get a chance to do things while surrounded by people.