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Vagina Tightness as a Function of Race

No.12605416 ViewReplyOriginalReport
Is there a scientific explanation for why Black women have the tightest vaginas?

My null hypothesis is that black vaginas are no tighter than Chinese vaginas and are no tighter than Russian vaginas but I'm concerned about measurement bias because tightness is sort of subjective to me.

unless they really are much tighter.
Does anyone with a PhD or more experience in study design guide me on how to proceed?