Full vinyl polysiloxane casts of the vagina were obtained from 23 Afro-American, 39 Caucasian and 15 Hispanic women in lying, sitting and standing positions. A new shape, the pumpkin seed, was found in 40% of Afro-American women, but not in Caucasians or Hispanics. Analyses of cast and introital measurements revealed: (1) posterior cast length is significantly longer, anterior cast length is significantly shorter and cast width is significantly larger in Hispanics than in the other two groups and (2) the Caucasian introitus is significantly greater than that of the Afro-American subject. quote: "The shape of the vagina also varies from woman to woman and can be categorized as parallel sides, conical, heart, slug and pumpkin seed [21,23]. When compared among races, the pumpkin seed shape was found to be specific to African-American women  To me, the most interesting data compared vaginal shapes among 23 African-American, 39 Caucasian, and 15 Hispanic women. The researchers found that the Hispanic ladies’ vaginas were wider overall, longer in the back, and shorter in the front than the vaginas of the other women. The study also noted that the Caucasian women had a much larger vaginal opening than did the African American women. So basically, Caucasian women tend to have longer vaginas at the front of the body (anterior), shorter at the rear. Hispanics tend to have larger overall width (what you would term tightness) with the shortest length. African women tend overall to have the smallest width (tightest). For some reason Asian women weren't included in the study. But from my own experience black women tend to have better grip in general because of muscle mass down there.