Osuche, yes I have had this problem off and on for the past 10 years or so. Changing things up (fantasies, lingerie, locations, et al) has helped a lot. The basic problem...and she admits it...is that she doesn't require sex as much as I do. I don't love her any less for it but it is sometimes tough to deal with. Sometimes I think I wouldn't mind having a g/f if it was discreet and with someone in the same situation as I.