system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are genitals darker than the rest of their owner?

... even though they hardly see the sun. Is there a reason genitals receive more pigmentation?
gpt
Your genitals have more melanin, which protects against UV radiation. A long time ago, humans and their ancestors didn't wear clothes, so such sensitive parts did need more protection against the sun.