Scientifically speaking, how do BDSM actors take so many hits to the balls?

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They take a lot of kicks to the balls. Even tough mma fighter wearing cups cant take kicks to the balls. Are these actors using drugs to reduce the pain or something? Ive also read about a doctor saying that the idea of conditioning your balls to take hits without pain goes against common medical knowledge about soft tissue.

>Im willing to bet if I put the guy on an exam table and hit him with a reflex hammer in the testicles, he wouldnt be able to tolerate it, Kelly says.
https://www.mentalfloss.com/article/639745/martial-artists-hit-in-crotch-without-hurting

I have also heard that many people into the fetish of ballbusting say that they eventually can take full force kicks to the balls. Are they telling the truth? Are they only able to withstand such force by taking drugs to numb the pain?

Im really hoping someone can answer this since I dont see how mma fighters cant even take a kick to the balls when they are even wearing cups, but these guys take multiple full force kicks