[EternallySingle]

At first it should seem like locker room talk, so you all know each others limits and fantasies. Depending on how well you know this man, your husband might jokingly mention that you two were looking to take some lessons in swing dancing, found these wife swapping sites, and thought "hmmm". From there, you would know instantly if it is something he would consider of if he'd be totally turned off by it. Don't say that you want to do it right away, but that it was something you play with occasionally by pretending to be with other people. Of course, in a guy talk kind of way (your husband will know what I'm talking about). He will know if its worth pursuing, then the two of you talk to him on a more serious level.

That will lessen the chance of him backing out or spilling the beans about you. It will also keep him from getting the impression that you want an affair.