system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why is it human instinct to writhe or squirm during intense pain or pleasure?

Like when you're being tortured or having an orgasm, you always feel the need to wiggle around.
gpt
I would imagine that it's an instantaneous, nonverbal way of communicating discomfort,pain or pleasure to other individuals. Without the visual feedback, it might be possible for larger individuals to damage smaller ones without knowing it. Along with squeals, chirps, and yelps, it helps prevent accidental or intentional damage.

Also, it can act as a nonverbal signal for help to other individuals (in the example of pain or anguish.) You see your fellow human squirming violently from afar and you know something is up.