This is my first post and I'm only divulging this because I'm running out of ideas and I'm becoming desperate.
I've been dealing with this problem for over a year now - ever since my first sexual experience. The thing is, I've been having difficulty coming during sex - no matter whether we engage in intercourse or oral - I just can't seem to cum. Whilst masturbating, I can reach orgasm in as little as 15 minutes, but my girlfriend can give me a blowjob for over and hour and it doesn't seem to affect me. I used to exorcise the muscles used to prolong orgasm because I didn't want to cum too fast when I started having sex, and now I'm afraid that I've come to the point where the muscles are working overtime. It bothers me greatly when my girlfriend cums enough times that it wears her out and I'm still stuck with a raging erection; if there's anyone out there that has some sort of advice - anything - please reply.