Via @courtwrites (and lots of others by now, but that's where I first saw the link!):
I read and reviewed Jessica Valenti's Purity Myth when it first came out back in 2009 and in my opinion it's the best of her published works to-date. I'm definitely going to check out the documentary version.
See also: my review of Hanne Blank's Virgin: The Untouched History.