system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is the color red used for the Red Light District?

Do the red lights have any effect on the brain with regards to sex drive?
gpt
No. It has to do with old world Asian influences actually iirc.

The streets with brothels used to use lanterns with red paper to mark the brothels, they were usually all in one part of town so criminal activity would largely be limited to the bars and whore houses and the "police" of their respective time periods could more easily contain unruly activity.

Thanks to the lanterns these places became called Red Light districts. It stuck.