I've had three sexual partners including my current girlfriend. With every partner, I have had this problem. I do believe it is psychological rather than physical. I am able to masturbate but with the previous two partners, it took a long time for me to be able to have intercourse with them. With my current partner, I so far have not succeeded in having intercourse. I am hard, then when I am about to put my penis inside her I go soft. It has been a problem for a few years now and it is putting a strain on our relationship. Has anybody else been in this situation and have suggestions.