i will agree that it varies from girls to girl...some girls have loose vaginas while others have tight ones and lots in between. I think the most important thing is just being able to feel the dick inside of you, ie girth. That's important for guys though too, they don't want to be fucking and not feel anything. Girls have to do their part by doing kegels! Anyways, so yeah, it's not length, it's girth. And penis size is totally irrelevant if you have some sweet tongue skills!