I'm a 21 year old male, and for a couple years now I have been having problems getting my penis to get hard when I'm with a woman. For example when I am about to have sexual intercourse with a girl my penis does not get hard easily. I always have to use my hand to stimulate it and as soon as it gets hard and I stop using my hand it gets soft real quick or while it's hard and I start using penetration with her my penis gets soft while inside her and I have to do the same thing again and this is really frustrating. While I'm with her I am very turned but the only thing that's not working is my penis. One more thing I lost my virginity when I was 17 and when I first did it everything worked perfectly I had no problem getting it hard, but as time went by all this started happening. Can you please tell me what is wrong with me is there any way to change this? it would really help me out.