OK, the headline is a little hyperbolic, but the nice folks at MetaFilter have accumulated the entire sum of human knowledge about what causes girl-on-girl action. Here's what it comes down to: if the other girl is hot, and there's no reason not to, well, that's fair game. HALLELUJAH!Also mentioned in the Metafilter thread is this: Buffy the Vampire Slayer swings both ways.Now, I'm a purist, in that the TV series never did much for me...so this means, by the transitive property, y'all can cut-and-paste Kristy Swanson into that fantasy of yours.You can thank Joss Wheadon next time you see him.