My wife and I have been married over 13 years (no kids) and are potentially new swingers. We are good friends with a couple our age. We went on a vacation with them this summer and regularly have dinner and drinks with them. They sometimes make comments about having great sex with each other or experiences with prior partners of theirs before they married. They have also mentioned small things here and there that have made me think they might swing.
A few weeks ago my wife and I were talking and realized that we both were thinking at some point we would all end up naked together. In fact, both my wife and I are very interested in the idea of swinging with this couple. After we discussed this and talked about swinging, I have to admit that we had some of the best sex of our marriage. We have both been reading this and other forums and feel that our marriage is fantastic and that having some play time together with this couple would be very fun.
We have never done this before, and want to capitalize on this possible opportunity.
So is there a good way to ask? Are there other "tells" we should look for, or is there something we should do that shows that we are interested?