I'm also married, so if that's a deal breaker, thanks for your time. My wife and I are exploring opening up our relationship after many years of monogamy (and a couple of not-quite-monogamy.) Not sure yet where this will all lead, but so far I've found out we're not alone on this journey, not by a long shot.
So just to be clear, though, I'm not especially looking for casual sex. I have neither the temperament nor the inclination to be a "player." I'm hoping to find a real connection with someone I can get to know, and have some adventures with (and not just the bedroom kind). I'm looking for more of a heart connection.
I think labels only go so far, but the one that gets used for this kind of thing is polyamory. It's distinct from swinging, because it's NOT just about married people hooking up. And it's distinct from cheating because both spouses know what's going on and are OK with it, so nobody's being lied to. If this idea freaked you out, I'm sorry. I don't want to freak anybody out.
One final note: I always check out the profiles of people who visit mine, but if I see you are looking for someone who is "single" I'm not going to reach out. This is probably just fine with 99% of visitors, but in case you are in the 1% I thought you'd like to know.