80% of men their left testicle hangs lower than their right.
Well if we're going for random facts about the reproductive system
The sperm upsuck theory is consistently debated by biologists as being the reason behind the female orgasm
For a period of time doctors were suggesting to males that they must stimulate their partner if they wished to have children.
This theory, however has been disproven to work on humans
Female pigs however, it's is excetionally benefical for insemination.
Have you ever watched a farmer inseminate a female pig and stimulate it to encourage the "sperm up suck"?
It's kinda funny-lookin'