I was masturbating every day & suddenly when I was going to masturbate again I could?t get hard & I often do ass play, I don?t if the ass play is causing this problem, so I jerked off after a long hour of trying, the day after the next day I was going to have sex & it got hard & everything but for a little while & I could?t keep it hard, i?ve tried masturbating too but I was suffering keeping it hard & the moment I cum it went down really really fast & am only 23 yo, so what seems the problem?