Been with my fiancee for 6yrs now, and I don't know what's happened me. Sometimes I'm so horny for 2 or 3 days and love having sex, then other times I can go without any for up to a month maybe more. She hates it so much that I don't have that drive to do it all the time. I don't no why but sometimes I just have no interest, and don't even masterbate either. Anyone got any ideas of what on earth is going on with me and what I can do about it?