Its unusual that (apart from homosexuals and bisexuals) most members of a particular gender do not know what thier own gender's genitals are supposed to look like at all. This is because you generally only see one example whereas you are likely, in the course of a healthy sex life, to see several examples of the opposite sexs' genitals.

As for homosexuals well, as Geoff in Coupling says, 'Masturbation is practise'

Never ever ever take what is seen on films/TV as being anything like a reflection on real life. Casting directors for porn films do indeed select women with a particular style of vagina and these women are advised to keep them at least partially shaved to make them easier to see on film.

Personally, I have always preferred the added challenge of lots of hair and lips to work round to find the spots. Did you know you can in some women suck the entire lips into your mouth and suck it like a penis? You just have to be careful of your teeth and, if you are doing a 69 position, watch she doesn't do anything that will likely make your teeth clench...