-->"I usually just go for it and move in just slow-enough to give her a chance to move my hand or mouth if she's not interested - other SCers believe it's best to just ask and that's probably the best way to go."
With a stripper who you don't know, and don't know her limits, I personally seek consent before touching her genitals, even in a high contact club. I am usually in Papi's latter group -- I just ask, I don't see only upsides and no downsides, and it does not "ruin the mood" for me if she says no. But, the fact is, as long as you move your hand slowly enough, she knows exactly what you're doing, so I think that counts as seeking consent.
Here's one of my favorites that I've only written about once or twice here: sometimes I'll just put my hand in hers and whisper to her, "put my hand wherever you want it" or something similarly corny. If she's ok with you touching her pussy, she'll pretty much always put it there; similarly, if she's not, she'll keep away from her pussy, so that gets you your implicit denial without "killing the mood". One of my minor victories was with a stripper who had steadfastly refused to let me touch her pussy (low touch club, so this wasn't super uncommon)... I did the "put my hand where you want it" routine, and after a little tour of her hips and ass, she put it right on her pussy. I'm convinced -- or maybe just blithely fooling myself -- that the fact that SHE was in control of the touching, is what got her to lower her limits. So, who knows, maybe if the girl is on the fence, giving her relatively more control of the action is more likely to get you what you want