Film poster is supposed to look like an hourglass. It looks like boobs.
Like the boobs of two girls facing one another. Presumably they're kissing. And naked. Perhaps the boobs belong to Kate Mara and Amber Tamblyn.
Well, I'm off to San Diego.
http://www.youtube.com/watch?v=xbLB3z_kFDw&feature=plcpshare