I'm a 33 year old male who was with the same woman for 13 years and never had any sexual problems. We split up almost 3 years ago. At first, I was able to be with multiple women and had no problems. All of a sudden, I was with someone and could not get an erection. I have tried several times with several differant women over the last year but I am unable to get an erection. The wierd thing is that if I masterbate, I have no problems getting an erection or reaching an orgasm. Anyone have any ideas why this is ?