I was not the sex thing for boxers so much as it was their running around looking for sex. Tend to go to bars and clubs, keeping late hours, not enough sleep and other bad habits(?), like drinking & smoking. If the guy was married, things might be a little better. Old time coaches called it the sporting life. Those trainers/managers started that myth that sex was bad for the boxers to keep them in the training camp. This idea bleed over to other athletes. Not getting any was the motto before the big game, for example. Still carries over to a lot of the Mexican fighters today. Another old coaches myth was that weight training made athletes musclebound.
According to most studies, losing sperm will have little affect (or non at all) with regard to training for size or strength. Of course if your blasting a pint or more of your baby batter 7 times a week, than that may be a problem. Or a blessing in some cases. Some of the NBA players are renown for the amount of sex right before a game. And quite a few have a core of groupies in every city they play in. Not to mention kids. Good Luck.
