system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do dogs always sniff my crotch?

They just stick their nose in there for a bit then get their fix and are out. It's always subtly weird because it's always someone's dog at someone else's house. What's the deal with that?
gpt
Dogs smell each other's crotches as a way of getting familiar with their scent. Your crotch works the same (also dogs are short, so your crotch is always typically right about where their head is going to be)