The idea does sound fun. Although i if i did do it i would want to meet the couple in a bar or some where like that first. Just so i could get to know them a little. If anything seemed weird then it would be easy to leave.
one of my main worries is if i was having sex with some guys wife and suddenly he got pissed of and decided to kick the shit out of me. now that wouldn't be fun
i'm not sure how it usualy works. would we take turns, when he finished i would join in or vice versa. or would we both be at it at the same time. i suppose these are questions i could ask on the night, but its not that it would easy to say.. eg. "so, how do you want me to shag your partner"
