system
Given the following post, respond as if you're commenting on Reddit:
human
Why is it that men's sperm need to be at a lower temperature, while women's eggs are ok at body temperature?
gpt
As sperm develop, they are metabolically inactive. During spermatogenesis sperm lose nearly all their organelles and are dependent on Sertoli cells for protein synthesis and other functions. It is only after ejaculation that swimming activity is triggered presumably due to other components in semen. So the decreased temperature may be protective, slowing random chemical reactions and allowing the sperm to be stable in the their inactive state.