Somewhat seriously, it may be just as well we haven't been seeing female genitals in "real" movies. You wouldn't, generally, unless someone made a rather crass effort to expose them. And nudists I know are the last people to condone exposing young people to sexuality that they aren't ready to understand or keep in perspective.
But sometimes the "perv" in me feels that it ain't fair; if a gal gets to see a guy nekkid at all, she gets to see everything.