hey im 19 years old and up until now sex hasn't been a problem. when im with my girlfriend, i can't get off. we had intercourse for over an hour and i never came. then last nite i couldn't even stay hard enough to continue. i know its not a physical thing because everything is working fine when im by myself, i was wondering if maybe anyone else has had similar problems before and what they did for it. im too young to be a viagra man!