The butthole on a woman (also known as the Balloon knot). When pressed it may only work 50% of the time. When taking her doggy style you press it with your thumb and she jumps and rejects, it works and ruins the moment. But if it dissappears in her ass then it doesnt work and you can continue.
I was doing her from behind and pressed her reset button. She screamed and yelled "what the fuck are you doing!!" As she put her clothes on and stormed out .
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