system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Is whiskey dick an actual thing and if so, what causes this to biologically happen?
gpt
An erection is caused by restricting blood flow out of the penis by muscle action. Alcohol is a nervous system suppressant and so would tend to reduce the ability of the body to direct such actions, which usually result from the parasympathetic nervous system.