The guy I'm seeing is a gym fanatic, and he believes that by not cumming he retains more testosterone in his system and that it makes him have better/more productive work outs. We'll still have sex, but he'll hardly ever cum, and he does this on purpose. Does ejaculation make testosterone levels in the body fluctuate enough to affect physical performance at the gym? Thanks to anyone who can give any insight. I've never been with a guy who didn't want to cum!