The last two times I attempted to have intercourse with my wife, I have had trouble maintaining an erection. The first time we kind of rushed into it for a quickie and I never really got an erection. Tonight, we spent some time in foreplay and I had a full erection from that. When the time came to stop, put on a condom and have intercourse I quickly lost my erection. The has never happened before. I am in moderate health, a bit overweight, and my diet might not be the best, but nothing really has changed recently that I can think of to cause this.