The last time I had electrolysis, by the end of the treatment I was noticing a mild sexual response at the end of each zap.
It was one of the most 'Oh crap, no' moments of my life - the last one I recall really was the first time I learned what being transgendered means.
I'm a sadist, not a masochist. So it's really perturbing to me. However, for you girls out there on the more submissive side, maybe you can get more than meets the eye out of it. I normally go into a zen state where i shift my consciousness to another part of my body, far away from where the pain is. Deeper to the core, or my thighs in past treatments.
On the last one, I think I was taking solace in the removal of the pain after each zap ended. Crossed wires, argh.