Uptown, I might be speaking waaaay out of line and this doesn't concern your situation, you can just tell me so!
First of all, how was the situation BEFORE this transpired? I mean, how long have you two had this relationship? Was it like that at first? Were you the one that did the iniating?
So many things can "play" in this, or some other issue, besides sex, is or can be the root of it. I don't know. I personally need more info.
Question: Do you both still flirt/tease or do the foreplay kinda thing? I mean, are you having fun outside the bedroom?