system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do athletes perform worse after they have sex or masturbate?

I mean, why do muscles get so tired after orgasms?
gpt
There is no physiological basis for the belief that having sex in the days leading up to a sporting event or contest is detrimental to performance. In fact it has been suggested that sex prior to sports activity can elevate the levels of testosterone in males, which could potentially enhance their performance.

 "Sex before the big game?". Nature. June 9, 2006. 

 "Sex and Sports: Should Athletes Abstain Before Big Events?". National Geographic. February 22, 2006.