Or at the very least, the people controlling the censor buttons seem to think the word vagina is too explicit.
This has happened before with iTunes, which has tried to ban books for foul language as well as for language it just didn’t seem to like. The store also blanked out the anatomical reference that plays a key role in the title of a British podcast called “The Vagina Monologues.”
The iTunes Terms of Service agreement includes this passage regarding “Objectionable Material.”
You understand that by using the iTunes Service, you may encounter material that you may deem to be offensive, indecent, or objectionable, and that such content may or may not be identified as having explicit material. Nevertheless, you agree to use the iTunes Service at your sole risk and Apple shall have no liability to you for material that may be found to be offensive, indecent, or objectionable. iTunes Product types and descriptions are provided for convenience, and you agree that Apple does not guarantee their accuracy.
However, a quick search of the Apple Store turns up countless references to male genitalia Why Is the Penis Shaped Like That? as well as fairly unabashed porn, such as this.