It would probably be difficult to locate such a specialized fetish type of place, as mostly the ones out there are for swingers in general. It would perhaps be better for you to meet some potential bulls on line through a service such as Adult Friend Finders, and then arrange to meet him (or them) at any bar or lounge to get acquainted and see if you hit it off...or better still, if your wife is turned on by him. That way all of you would already know in advance what specifically you are looking for. If you did not want to participate you could send your wife in and you could observe from a safe distance. You and her could have a pre-arranged signal to tell you, "yeah, I want to fuck this guy", or "no way". You could then take it further from there.
