http://www.ncbi.nlm.nih.gov/pubmed/24464469
http://www.ncbi.nlm.nih.gov/pubmed/20042169
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2593128/
http://www.ncbi.nlm.nih.gov/pubmed/10895030
All these links and studies show that black women's vaginal canal's are smaller, the pelvic muscle strength is stronger than other races. The explanation being black women have more musculature in their PC muscles as well as their vaginal canal's being smaller due to that race naturally giving birth to babies with smaller heads than white or Asian women. Also the rates of incontinence is smallest in black women.
There is definitely a racial difference and also genetic factors which determine the length of vagina. White women give birth to babies with larger heads "on average" so their hips are "on average" broader, and their vaginal opening is also larger. Black women, actually have smaller vagina's. They give birth to babies with smaller heads and have smaller hips. Black women store more body fat on their buttocks, but their hips are actually smaller (men and women). White people also have longer torso's and white women also have longer vagina's. Asian women have shorter vagina's than both black and white women, have wider openings than black women, but not as large as white women. Unlike penis size, the body size/shape of a woman has an influence on vaginal size. Taller women (longer torso) with wider hips will most likely have longer and deeper set vagina. Torso size/length is more significant than actual height. As for men however, a 6' 8" man may have a smaller penis than a 5' 8" man, just like has ears may also be smaller. External organs are not influenced by body size or height, whereas internal organs are.
My question is how come black men have bigger penises but black women have tighter vagina's?
And before admin deletes this I have an actual question and this is scientific research.