Why can we never see a VAGINA?

Ever notice that R-rated films will NEVER show a woman's vagina, even though several films have shown penises?

Notice when the actress was nude with her legs apart in Black Book while dying her pubes, great care was taken to show only her pubic hair, and avoid showing any of her actual genitalia. The MPAA will NOT allow a woman's genitalia to be shown in an R-rated film. The most they will allow of a woman to be seen is her pubic hair. Pubic hair is NOT genitalia, it is just hair! But a man's entire genitalia (pubic hair, penis, and testicles) can be shown, and were shown in this film. Why does the MPAA allow the full genitalia of men to be shown, but not women?? It is an unfair, sexist double-standard designed to keep the female genitalia hidden and repressed from society. When will a filmaker have the courage to put a VAGINA in a film and SUE THE MPAA if they try to rate it NC-17?! The sexually discriminatory rating policy of the MPAA regarding genital nudity should not be tolerated! Full genital nudity should get the SAME RATING, regardless of the gender. If penises can be shown, then so can vaginas.
F!CK the MPAA !!