Hmmm, there are a lot of reasons why one may not stick to one's pole.
So... Are you warm? As in, have you warmed up for about 20 minutes of mostly-cardio exercise, gotten the blood flowing, moving around, etc?
Is your pole warm? Have you used it while you were warming up, so that the metal is warm and more grippy, allowing you to stick to it?
How's the temperature in your room?
Are you majorly sweaty between your legs?
What kind of pole is it? TG, Stainless, Powder coated, chrome? Some of these may be more difficult for some people to stick to!
Do you have the grip between your thighs right? I know a pole sit looks pretty easy, but sometimes... You gotta play with your grip!
And, finally... are you using just your skin on the pole? (I know this sounds like a no-brainer, but... much like asking "Is it plugged in?" sort of a necessary thing!)
Any or all of these can be a huge factor in thigh grip with pole dancing. I know that I stick to things fairly easily with my hands, because of the different skin and the fact that my hands are usually the warmest part of my body, but... thighs are a different matter!