1908 Male Chastity Belt, aka "Keep it in your pants" (click for details)

The original title of this US Patent is “Sexual Armor”, and boy did they mean it!

Here’s a quote from the patent text:

“It is a deplorable but well known fact that one of the most common causes of insanity, imbecility and feeble mindedness, especially in youth, is due to masturbation or self abuse. This is about equally true of both sexes.”

This thing looks like something from the movie "Paper Clips Gone Wild!" All I can say is OUCH!