It depends on the situation. In karate I was kick ass, and didn't even wince when I took hits as a child. And as a child at home, I could disassosiate and tolerate a lot of pain and abuse from one abuser but coulden't tollerate as much from the other. When my mom hurt me, I had less of a pain threshhold then when the non-family abuser hurt me. It hurt more from my mother, because she was supposed to protect me theoreticly; the other abuser hurt less, because I saw her as pure evil and didn't have any emotinal connection to her other than hate.
I was abused since I was a little child so I can't say if I had more pain tollerence before or after; I can't remember a time before I was abused. So for me pain tollerance is about context.
I do know that my pain tollerence is redicuolusly high. And that in a fight I can take a beating and keep going without crying or dwelling on the pain, but if my bf grabs me to pick me up his fingers hurt me and I'm a big pussy about it. I think the diffrence is, that I feel safer with my bf and let my gaurd down, but in a fight or when I was abused I could disassosiate and keep my walls up and know that I was being hurt but not really feel it or dwell on it.
there was a time in my life where I really enjoyed kinky sex, and boy can I take a spanking in that context and an have exstreemly high pain tollerence, but if the same lover were to slap me outside the context of roleplaying I would be hurt and freak out (not that they would or ever have, if I thought they would I would leave them). But even in the context of role playing, I could never handle certin things, they must and do remain off limits. Spanking while role playing in bed is fine, but choking is never alowed.