A female who keeps her 'virginity' intact by only participating in anal sex. Orginates from Vassar, a school in upstate NY known for the whores and pseudo-feminists that like to pretend to be goody-two-shoes or pious (religious) girls. May also include oral sex as well.
"So you fuck her yet?"
"Not in the cunt. But she lets me fuck her ass. She says she's keeping her hymen intact until marriage."
"Oh I see. She's a Vassar Virgin then."