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First of all, as much as we might want it to be, sex with a girl at any time is not some god given right.
Second, as you probably know, there is a big difference between men and women. Men almost always have sex on the brain, and most women don't (at least, not to the same extent as guys).
Suppose that a woman wants for something to happen, and she knows that you like sex a lot. She may try to withhold the sex until she gets what she wants. If you give in an give her what she wants, then she will likely do the same thing again. It's called behavioral learning. Simple stuff.
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