1. Physical exercise promotes androgen secretion, which plays a very important role in the production of male sexual desire and the maintenance of sexual function, but it is not the only factor to maintain adult sexual desire and sexual function. After exercise, human metabolism will be accelerated, and an important hormone-adrenaline will be increased. It can affect the biochemical reaction of various cells, which is beneficial to improve nerve excitability and stimulate sexual desire. Therefore, it is normal for sexual desire to increase after exercise.

2. But you can't have sex after fitness, because exercise consumes a lot of protein and testosterone, and protein and testosterone are the material basis for maintaining physical strength and erection. Although the increased adrenaline can affect the biochemical reaction of various cells and improve the nerve excitability, it will constrict blood vessels, which is very unfavorable for maintaining erection and even has a certain inhibitory effect on erection.