Roll After Dark

Genital impact — cock, balls, cunt, tits

Squeezing, slapping, stretching, or striking the genitals of either body.

Why people do it
The genitals are the most guarded part of the body, so handing them over is a bigger gesture than anything done to a back or a thigh. Controlled, it produces a very sharp, very specific pain.
Smallest way in
Squeezing by hand only, at a level he calls out on a scale, with his own count as the limit.
What to watch
Nothing with an edge, nothing above a level he can talk through, and stop instantly for nausea, which is the body’s first warning here. No striking the testicles with anything rigid. Anything tied round the base of the scrotum has a hard time limit and comes off for colour or numbness.
In the planner
30 different things carry this tag, and switching it off removes every one of them. The mildest of them sits at easy.