I find that the constantly changing sensations throw me off. I mean it's fantastic, and I love the way every area gets lavished with attention from someone that knows what she's doing, but until I get a nice rythmic in-and-out motion going, it's just not gonna happen for me. And yes, there have been a few willing to stick it out, find what works for me, and get me across the finish line, but those were very few.
I think some of what's been said of how to eat a pussy is to blame. Conventional wisdon says to never do the same thing twice, draw letters with your tongue, always move in different directions, stuff like that. That is exactly OPPOSITE of how to get me off. Sure, start out with all the stuff you want to do, but if you want me to cum, then use your lips and tongue and slide up and down the shaft using a very consistant rythym. Do that and I'll be squirting your tonsils in no time.