system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it bad if you have an erection lasting longer than four hours?
gpt
other than the fact that its an inconvenience - having blood remain in the penis for such a long time (blood rushes to the penis during an erection) causes blood to become deprived of oxygen because its not being circulated. also causes damage to the organ.