If by hole, you mean the vulval cleft, the hips move forward or back, and that makes the cleft look longer or shorter. The start of the cleft is in front of the bone called the pubic arch. The amount of fatty tissue making up the mons veneris also has a part in how long the cleft looks. More fat, less distinct cleft. The actual hole, though, is the vaginal opening, and that is rarely seen except in wide open poses. I hope this helped.
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