system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do humans like to watch other humans dance?
gpt
One theory is that dancing is a way to demonstrate bodily symmetry. Symmetry is one of the main criteria we use in determining beauty, as it can be a decent indicator of good genes and good nutrition, both desirable in a mate.  

So it taps into primal mating urges far older than civilization.