>>279731901because it isn't just blood coming out of there
it is literally a puddle of blood, bacteria and other disgusting fluids present in the vaginal flora that clumps before coming out
vaginas compete with anus and mouth for the most disgusting human parts
like one day without showering can be the equivalent of like 3~5 days for a man without washing his penis, this is how easily disgusting a vagina becomes if the girl does not higienize properly regularly