so much easier for her to be on top as she can bob her head. Also, as her knees are on the bed/floor where ever, they can't snap shut around his head as hard. And yes, sometimes she can make my head feel like it is about to burst from her thigh pressure. As for riding face, kneel or squat over his face while he is on his back. Make sure that you are holding onto something, ie: headboard or wall for balance.

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Cowboy logic, always drink upstream from the herd.