In the Tina Fey movie, "Whiskey Tango Foxtrot" Fey says, "...I pee out of my vagina..." Do most women have such little knowledge of their own anatomies that they'd make such a mistake?

...or is she complaining of a urethro-vaginal fistula?

I suppose that's possible, but no mention of malformation was made. I still wonder how many women - and men for that matter - make this assumption.

Given that Tina Fey is a comedian, could she just have been making a joke out of her audience's misunderstanding?

I suspect Bob is right. Women do have an understanding of their anatomy - though Hab could be right too.