I fear loss of sensitivity

I'm finally moving into my own place in the near future and was eager to use some niche hook up sites to find my first ballbusting partner. Then I read something that gave me pause. It was from the perspective of a dominatrix saying how boring it was for her to try and bust a guy that had been doing it for so long that he could take her very strongest kicks with little more than a grunt and a twitch. That level of pain tolerance kills the enjoyment for her, because she loves getting that big reaction where the guy cries out, bends over, rolls around on the floor etc...

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Personally I'm on her side on this one. The thing that always gets me so excited and aroused when I think about ballbusting is the idea of being vulnerable and helpless. I want to feel like I'm at the woman's mercy. I want her to make me squirm, squeal, beg, plead, and say or do embarrassing things for her with only the slightest bit of force required on her end to put me in agony. I want her to flaunt that power over me. If my balls ever developed the sort of pain tolerance that domme was talking about, it would kill all the enjoyment for me too.

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I've seen porn videos where it looks like the male model can already take hits that would leave me crumpled on the floor crying one after another without much reaction. Sometimes it's painfully obvious that they're faking the reaction. So I get the impression that this is a real phenomenon that can take place over time.

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It all got me a little worried that if I'm not careful, there may come a day where I can no longer enjoy this type of play. As it stands right now I've actually never been hit in the balls before so my sensitivity level, and the power a woman could wield over me, is incredibly high. What can I do to ensure that my balls remain super sensitive, so that women can always make me squirm or force me to the fetal position with minimal effort?

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One thought that occurred to me is to rely on very light/playful but repetitive hits. I was rather surprised to discover that a gentle smack that barely hurts at all, when done continuously, seems to build more and more pain until it becomes unbearable to me. Same thing with flicking or a light squeeze that never lets up. Is that perhaps the way to go? If so then I'm not sure I still trust a random hook up not to go too far. I would also kind of miss the idea of being floored in one fell swoop by a good hard kick, knee etc...

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I also wonder though, if I'm being a little too worried. I know there are people out there who take special measures to try and increase their pain tolerance. I'm not sure if loss of sensitivity is something that tends to happen naturally with regular play, or if it's something that only comes from dedicated training, or the more extreme stuff like needles and skewering (ya I've seen vids where women drive skewers through testicles, and they're awesome).

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Maybe someone that's just been doing regular ballbusting stuff for a long time can chime in and tell me if they can still be brought to their knees by a single good hit like when they started, or if they've noticed a loss of sensitivity over time?