well, let's just get this one out of the way right off the bat...
Is your sex starved marriage now over?
If yes, then let my start by apologising for even coming close to making such an assumption. (We tend to have a bit of a problem with married, single men.)
Of course there are people out there who are interested in single men. There are people out there interested in all sorts of much crazier things. That being said, there are some challeneges associated with your position. There is already a lot of good advise around here for single men trying to get into swinging.
Check out the singles forum.