In another article, I mentioned the push-pull dynamic, which in basic terms means that the more one of you does something, the more the other person disconnects from it. Think about it in terms of lasagna. You both love it, and you happen to make a pretty damn mean one. So one day, she asks you to make her one, and you're like "Hell yes, I'll make you a lasagna. I am the Whitesnake of lasagna, baby!" Then the next day, she asks again. And every day after that until you finally snap:
"I'm going to stay with my mother. At least she sees me as more than just a great cook with an enormous penis."
"No, I'm not making any more fucking lasagna! What the hell, is that all you think I'm for? My perfect blend of mozzarella and not-too-tangy sauce? Well, I'm not your lasagna factory! I am more than just a vessel for delivering Italian food into your stomach! It wouldn't kill you to make me some food for once. Oh, that's right, just walk away and watch your cooking shows like you always do. Sometimes I think you love their preparation techniques more than you love me!"
If you press for sex too much, even if you don't think what you're doing is all that harmful, it is absolutely going to enter that push-pull model, and the very idea of having sex with you is going to become repulsive to her. It's Pavlovian in the respect that you're training her to loathe your dick.