There comes a point in certain shows where hookups between characters reach a tipping point - everyone has slept with almost everyone, as well as shared experiences with randoms.

After four seasons of the original 90210, Kelly had slept with Steve, Brandon, and Dylan. By the third season of Grey's Anatomy, George had slept with Meredith, Callie, and Izzie.

Gossip Girl may be the craziest of all. With a fourth season underway, how can we even keep these dalliances straight? N.Y. Magazine has found a way: The Definitive Hookup Chart.

Click the image below for the fully interactive version on their site!

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.