Erotic Pain vs. NonErotic Pain

[^firefly^]

I was thinking of this thread earlier, in responding to the M is for Masochism thread.
I'm always fascinated by how small, mundane things that hurt can be highly erotic, but sometimes even in sexual play, there are kinds of pain that I don't enjoy (either because they push too close to personal issues/limits, or because they were delivered in a way that I didn't enjoy).
I know I mentioned the example earlier in the other thread about cutting myself, and how it "hurt" but also felt good. Are there some kinds of erotic pain that you guys like, but are are hesitant to explore, because you're afraid of liking it too much?
And on that note, are there things that some might classify as erotic play, but turn you completely off? (Needles do it for me, I'm deathly afraid of them!)
I know these are kinda rambling personal questions, but my mind was ticking it over this morning...and besides which, I'm nosy. Feel free to ignore me.

[Jensen036]

I have had an abusive master in the past. I was beaten because he had the ability to do so, not because he knew I would derive pleasure from it. He only enjoyed it because he loved to see me beg and grovel, to me that is not erotic. In my opinion it can only be erotic if both sides derive some pleasure from it. In most cases I did not find the pain erotic.