A big part of having an orgasm is self-esteem. You have to feel sexy and unashamed of your body and your desires.
It's more likely that a smaller waist circumference is correlated with "feeling sexy" and that this feeling, rather than waist circumference itself, is resulting in a higher propensity to orgasm.
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Orgasm and women's waist circumference. (U.S. NIH) · HackerTrans
It's more likely that a smaller waist circumference is correlated with "feeling sexy" and that this feeling, rather than waist circumference itself, is resulting in a higher propensity to orgasm.