Like you I wank as much as possible because all the time I am wondering what they are doing. The best for that was my exgf, she used to go to all night BBC swing parties, sometimes all weekend and on one occasion a 5 day affair. my now wife has only done one on one so far but one guy took her to a swing club, she says they had sex in a room with a few other couples and a very large mirror in it. I told her that behind the mirror was likely to have been loads of people watching them fuck so loads of men and women have been watching them. She seemed more excited than upset at the idea, but we had a bad experience with one of her fbs and she hasn't swung since