Hmm. I don't think its a 'don't touch me there' thing as much of how to touch. I will say I don't like being tickled intensely at the most ticklish spots (underarms, etc...), it gets to be too much. And the context thing: who's doing it, whether there's any warm up... I guess the whole 'mood' thing. In a perfect scenario, I think any ticklish spot is in bounds. If any of that makes sense?
So, to keep tweaking the thread a teeny bit... out of all your ticklish spots, do you have a favorite one where you want to be tickled most?