Testicle

The testicle is a sublocation of the groin for male characters.
It is named in the Testicle Grab technique on page 40 of Martial Arts: Technical Grappling.
There does not appear to be any sort of upper limit whatsoever on the injury applied this way, so someone might theoretically die solely from this being done to them.
B421 rules about capping damage to the amount required to cripple a body part only applies if the body part CAN be crippled. It was written only for limbs and extremities.
B420's Last Wounds similarly only applies to those two things. So unless a testicle is considered an "extremity" it is not possible to ignore injury to it reducing HP indefinitely.
Adapting S127's Mental Crippling rules to physical injury seems like the best guideline to avoiding this absurdity:
:"the groin, whose damage threshold is HP/10."
This makes a testicle equivalent to an eyeball in terms of difficulty to cripple, and harder than the HP/5 it takes to cripple an extremity when targeting the joint, which seems realistic.
Testicle Grab actually makes more sense for describing the initial grapple of the groin (similar to "Face Grab" or "Eye Grab" setting up Eye-Gouging) with "Testicle Crush" being a more apt term for the subsequent attacks done to injure or create pain.
This is analogous to some other attacks like Strangle or Worrying
Category:Hit Locations