Who told you such nonsense? If you are a woman, then having sex before a competition is even beneficial. After sex, a woman becomes more collected, more confident. She, as though, takes some of his strength from the man. But a man really shouldn't have sex before a competition, he kind of gives part of his strength to a woman.
Abstinence gives strength and energy under the condition of skillful sublimation. See Sivananda's book "Brahmacharya Practice" for details. In order to properly redirect energy, there are certain techniques, but you need to know the basics of yoga. So friends - knowledge is power!
I, of course, by no means an expert, but, for some reason, the first thing that came to mind is sublimation. That is, in this way athletes can compensate for the dissatisfaction of their sexual needs, redirecting the accumulated energy to achieve other goals, for example, to win. Doubtful guess, so if this is complete nonsense, you can safely minus :)
I can answer your question by linking to two episodes from the Sports Science program.
https : //www.youtube.com/embed/wO3zO02Z8dk? wmode = opaque
1 video is a guy, the second is a girl.
PS Knowledge of English is required.
In our volleyball environment, there was an opinion that men should not have sex before competitions, because, as they said above, "concentration decreases" and it seems like it "relaxes" men - athletes, but for girls, he (this is the sex), on the contrary, it is useful: supposedly girls and women have a psychological and physiological rise. Probably, it depends on the girls, for example, my mood definitely improved :)
I can't say about men, I need to contact them.
From life: one friend has a young man on command he was professionally engaged in wrestling, so he stopped indulging in love with her a week - one and a half before the competition :)
Perhaps I will analyze it in detail, because the side is two-faced, and I consider the statement itself exaggerated, although many athletes will disagree with me (because they said otherwise in eminent publics).
In general, this is the case. Any sane physician or biologist will attest to the fact that testosterone levels increase during sex, thanks to this hormone, the athlete is more focused and aggressive in training / competition. But the flip side of the coin of this story is that during sex, another hormone, prolactin, rises in parallel. The latter, in turn, reduces the production of the former, but not enough to bring it down to the usual level. This argument is usually the basis for tabooing sex before competition.
But there is still a share in the positiveness of the ban. With prolonged abstinence from sex (and twitching as well), testosterone rises to a maximum, then gradually decreases. The peak level occurs on average on the seventh day of abstinence.
In the end, I will express my opinion. For me, regular sex will not affect your activity in any way if you are healthy and physically developed. The only thing that can squeeze you like a rag is a sexy marathon comparable to cardio for several hours. If this is not planned, then play on your health.ッ