YO IM 18 AND LATELY IVE BEEN HAVIN ERECTION PRBLEMS!!!!!IVE BEEN HAVIN SEX SINCE I WAS 13 ,AND NEVER HAD AN ISSUE WITH THIS WHAT CAN IT BE!!!!BECAUSE I USUALLY HAVE HARD ASS ERECTION WHEN I MASTURBATE BUT WHEN IM ABOUT TO HAVE SEX IT HARD AS HELL TO HOLD IT UP, MY GIRL SUCKS ON IT AND GETS IT HARD BUT NO TO THE FULLEST AND WHEN IM ABOUT TO PUT IT IN IT STARTS TO GO BACK TO ITS NORMAL SIZE!!!! PLEASE NEED SOME ADVICE!!!
i think u are too much involved in sex. strictly stay away from sex, girl friend and masterbation for one month.do not even think about sex.give a month long rest to your penis, testes and sex hormones. take b complex vitamins.hopefully, your problem will be solved.