Len, first of all quite a few of us men are curious about the other men's cocks. And, from the responses we've had on our stories about this a lot of the wives are very turned on to seeing their hubby's experiment. Secondly, I agree that a movie or even one of the stories about the subject shared with your wife would be a great way to bring it up..., pun intended!
Ok, lastly, you've already said almost exactly who the two of you are already..., so, it's a bit late to hide. LOL! And, wouldn't it be wonderful if the person reading this (who knows you) might just be that couple who you both know, like, and fantasize about already? You know, the ones you'd never have the guts to approach, or they you? Well, now! That's always been one of my fantasies with writing the stories for this site. That friends of ours would read them, recognize us in them, and feel comfortable to come forward and approach us! Anyway, good luck and I hope things work out for you. I'm just waiting, with permission, for that perfect situation to experiment myself!