system
Given the following post, respond as if you're commenting on Reddit:
human
Can hot tubs kill sperm?

I know that sperm can only survive at a temperature lower than the normal body temperature.  So then, does sperm die when someone is submerged in hot ( >100F) water?
gpt
It won't completely die, not immediately anyways. Although the water is warm it doesn't mean that the gametes will just fall over dead. It depends on the temperature of the water, the pH, the salinity, how long it has been in the water for, and so on. Eventually it will die if left in the hot tub, because of osmosis and the majority of it's enzymes being denatured, not immediately though. Saying that don't spread your gametes in water, you're not a Pteridophyte. If you were wondering if "having sex in a hot tub" is an effective means of birth control; the answer is no. While the hot tub maybe hot enough to eventually kill the sperm, her vagina is not. The hot tub will not make you temporarily infertile either, because you're body does a good job at maintaining homeostasis, so the sperm will still be fertile. 

TL;DR - Having sex in a hot tub is not an effective means of birth control.