I discovered recently that it is becoming very difficult for me to ejaculate. Sometimes it's impossible. Now, this may make me some kind of sexual superman as, yes, I do get an erection, and am capable of functioning sexually, but being incapable of climaxing means it could go on for hours. The last two times I had sex I was not able to orgasm at all, and it has been progressively getting more difficult to achieve orgasm for a while. Any thoughts?