only grinding is a problem
I just discovered this same problem with a new girlfriend. It's the weirdest thing. I'm on my back and she's sitting up in cowgirl... as long as the motion is up and down along the shaft, everything is great. As soon as she grinds back and forth, I immediately deflate. No matter what muscles I relax or tense, it's like she's holding open the release valve and all of the blood drains out.
It's freaking obnoxious because she loves the grind!
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