system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do guys have nipples?

It just randomly struck my mind, mid-walk. They have no function, surely? Help or I'm going to lose sleep over my pointless, pointless nipples.
gpt
Nipples develop in the womb before the fetus is 'sexed', the nipples have already firmly positioned themselves before that process starts, so prior to the fetus becoming male or female, they already have nips.