How did you 'train' yourselves to last longer during sex? I've heard something about, masturbating until you feel you need to cum and then stopping for a while then starting again? Also, does anyone have or have had the problem of losing an erection say when chasing positions during sex? My partner loses his if we change from one position to another, I think because it happened the first time he's become self concious about it and now it happens almost every time and sometimes after a few sessions even goes down when inside of me but that is due to exhaustion (since it's like the 4th or 5th time). I've asked him what he thinks about and such and he says his mind is usually blank although he is trying to concentrate. He was a virgin when we met, so he is still really new at everything which could explain some of it. I'll/we'll appreciate any help.