system
Given the following post, respond as if you're commenting on Reddit:
human
Why does sperm get sticky when it comes in contact with water?

I was just wondering why this happen, for example when you take a wank in the shower and you cum on yourself the cum gets all sticky and is very hard to wash off. Is there some kind of chemical reaction the sperm and the water? Does anyone have an answer to this?
gpt
It's an interaction of polarities.  Water is polar, while semen is largely enzymatic, fatty acids, which are hydrophobic.  In the presence of water, which, by definition, is hydrophilic, hydrophobic molecules aggregate together to minimise surface energy.