It was always hot watching my wife kissing another guy, we would go out on the weekend and I would always let her go in the club by herself and wait in the car for an hour or two drinking beers, then I would go in and sit at the bar and watch her flirting with guys,
She would dance with them and sometimes kiss them on the dance floor or go and sit in a booth and make out, the best part was a few times when I actually saw her getting fucked by a guy in a dark corner.