I have a friend that is in his late 30's dating a woman the same age. The issue is related to .. you guessed it.. sex.
My friends GF has told him about her wilder side when she was younger, some pretty exciting stuff. They have seriously dated for two years and are looking to get a place together (mutual decision). The problem is that she is now rarely interested in sex about once every three weeks or so. She has told him that she thinks it may be related to her thinking she is premenopausal. She is very, very independant and totally trustworthy, not looking for a free ride in any way nor is she screwing around.
He is quite confused and frankly frustrated by this. Bring on the advice.