I searched through the forums, found posts alike this one but they didnt answer my question. So please excuse me.
My problem:
When masterbating, my erection is fine, no problems at all. But lately when having sex I either dont get one or get a really small one... I DONT GET IT!
I felt really embarassed yesterday with my GF. I had a small erection, did her for a lil bit but then it went away. :(
PLEASE GIVE ME SOME ADVICE! Btw, I am 16