system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is there a "seam" on scrotums?

I've always wondered but never cared enough to ask. But now I'm bored so ya know... Reddit.
gpt
Early in development of the fetus all humans are basically arranged as females. The seam of the scrotum is where what otherwise would have become a vagina binds together. The penis is basically formed from what would otherwise be the clitoris.