system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do peoples eyes roll back when experiencing extreme pleasure?

Just wondering the reason for peoples eyes rolling back during intense pleasure like during orgasm or while on mdma?
gpt
Rolled back is your eyes natural / at rest position - your muscles keep them pointed forward.  During sleep, orgasm, moments of extreme distraction, etc these muscles may relax fully, causing the eyes to roll back slightly or completely.  Drugs may also interfere with these muscles causing a roll-back effect.