I'm 16 and I'm having a problem.. When I'm about to have sex or in the middle of sex my penis goes soft.. Whenever my girlfriend is rubbing her body against it or just rubbing it, it gets hard but when were about to have sex it goes soft.. This isn't the first time it happened too, this gas also happened with privies girlfriends of mine.. I want to have sex but I know I won't be able to get hard.. It's really effecting my sex life.. I feel like my girlfriend this I think she's not attractive to me.. I need some advice ASAP. I'm 16 and shouldn't be having this problem..