Well, this seems like an appropriate thread for my first real post, since this is something that I'm *very* into. My on-again-off-again-depending-on-what-day-you-ask-me girlfriend and I have done a fair bit of swinging in the last few years, and this has been a staple of our sex life. Here's how it started.
Before we started swinging, during one of our breakups she started seeing this guy named Kurt. She would call me in the middle of the night to tell me how incredibly hung he was and how his manhood ripped her insides apart, and tell me wild stories about how she had laid him in front of strangers at a club with people taking pictures and videos. She was doing it to try and make me jealous at the time, which it did, but I found the thought of it incredibly arousing.
Then later on after we made up I was fooling around on her computer and found the pics of her and Kurt.
Every word of it was true. Right down to the number of people watching. I got so turned on I couldn't stand it, and I actually got up a few times in the night and masturbated to the pics while she was sleeping. At first she didn't know I had found them, but I finally said something and let her know that I liked them. So we started looking at them together and she gave me a play-by-play commentary on each one.
After we started swinging together this was #1 on my Christmas list, and she's had a lot of hung studs since then for my amusement. :tongue: The appeal for me is a little bit of everything that's been said in this thread. Kind of like watching a porn, only live and in living color. There's also a little bit of the cuckold in me that wants to see her get plowed by a real man who can make her squeal like I can't. Mostly though, I think it's the role playing aspect of being able to put myself in the stud's place and pretend it's my dick making her squeal like that. I get to watch her enjoy something (and she DOES enjoy it, trust me) that I can never give her, and I get to be a witness to a truly awesome display of masculinity that I would never get to see otherwise. So basically, everybody who has posted is right.
But a word of caution, though.... this can be very much a case of "be careful what you wish for." The first time we actually did it, she got a little too into it for my taste and I cut it short, causing a very bad experience for all concerned. The first time I heard her make sounds I had never heard before, I couldn't take it. But we talked it over afterward and sorted things out, and it's now a favorite practice for both of us.