She demonstrated the whole move in detail on a sock with two half-ripe plums.
Yeah, males balls are very sensitive but they are quite resilient and can withstand a lot of punishment.
Any vulnerable spots your attacker has open, strike them.
If he has a loose scrotum sac this should cause some irreparable damage to his organ especially tearing the spermatic cord or detachment of the epididymis from the testis.
I have to admit, I had some doubt about the men.
For example, I will usually actively call someone, even if I have nothing to say.