Sonato: I have wondered as I've read your posts... WHY DID you marry H? If the sex was that big of an issue before you married then why? And before you think I'm picking on you... I had the same issue... Sex w/ XW before we were married was okay, but not fantastic. I put it down to her inexperience. What killed things for me was her pattern of withdrawing and pulling back when she didn't get her way. I see now how this was prevalent and eventually led to ME having a very brief A. I, unlike XW, decided that was really wrong, that I wanted to be married, I just didn't bust my butt showing her.
You need to decide what is important, being married to H or going off and finding your "SOULMATE" or in this case being w/ OM. Just know that the circumstances of your R w/ OM do NOT bode well for a LTR. You do, however need to be honest w/ H. Sounds like both of you are somewhat immature.