hey, girl, haven't stopped by in awhile. Had to go back and find out who your OM was.
H and I have been intimate on and off through this whole mess. I only refused him when he was sexually involved with OW. Surprisingly he has been very honest about those times. I know what you mean about feeling used when he goes to sleep downstairs. Usually when H and I were intimate, it would be downstairs, he felt uncomfortable in our married bed. I just stayed downstairs with him. When we did end up upstairs, he usually stayed up there.
Bottom line, I think Sara is right (and she has always told me the same thing!), that if you are comfortable with it, there is nothing wrong with having sex with your husband!