Phisick has an amazing set of vintage medical equipments from antique surgical tools to weirder stuff like this extremely rare German spermatorrhoea (nocturnal emission [wiki]) ring:
An extremely rare Spermatorrhoea ring fastened with a screw. With provenance from the original German catalogue dating from 1894. Spermatorrhoea means involuntary loss of semen, although the rings were also intended to prevent voluntary discharges from masturbation or Onanism (Originating from Onan who originally "spilt his seed on the ground" Genesis 38:7-9). The ring was placed at the base of the penis and fasted with a screw such that any engorgement of the organ would meet with the teeth of the ring and arrest the process.
We've actually used one of Phisick's object in our What is It? game (in collaboration with the What is it? blog), but the gorgeous objects in the website deserve a post (or many future posts) on its own.
Really, if you only click on one link today, this should be it: Link - Thanks Laurie!