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The pain emanates from inside the stomach: How do you handle the pain, what is the allure of internal organs hurting?
If only the balls were hurting, that is one thing, but I cant get turned on by iternal pain..

This is simply the mechanism of that pain. It's made so it's the most discomforting one.

Why not only balls hurting? Well, in fact only they are hurt, but what really feels the pain is not the balls but the brain. And how he handles the signal from some particular nerves (in the balls) is up to the mother nature. Obviously to discourage ball damage as much as possible, nature got the pain to be greater and wider, that's all.

p.s. I don't handle it, pain is not something sexy for me.

Are you asking based on personal experimentation?

If you are, you might be doing it wrong for yourself. Personally I don't like the heavy internal pain at all. Some people do, it's preference. If you don't like it, maybe you should try lighter ballbusting and taking some time to let the pain subside before applying more.

For me it's the pleasure that comes with the pain, the feeling afterwards and the mental fantasy/idea that's nice. The pain itself is just a means to an end for me. Once the pain outgrows the reward, it's no longer fun.

If you are just starting, try to use small increasing slaps/taps to figure out when the pain actually starts. Then try to increase slowly and see when the bad internal pain starts. Then you can try harder single hits to see what gives that pain. Squeezing the balls will give the internal pain much faster in my experience.

Try to find your own limit.