do womens vaginas get looser every time they have sex?

had a drunk discussion about this with a group of both women and men last night.. the women were all saying it always returns to the same size.. the guys including myself have noticed the more partners a girl has seemed to have the looser the feeling... i have researched the internet and it pretty much says it returns to the same size, but that doesn't make any damn sense.. im assuming if a girl did a 100 dudes that shit would be loose as hell.. what do you guys think?