I’m straddling Katy O’Brian on a gymnasium floor and fighting for my life to keep composed. For the record, taking a private jujitsu lesson was her idea. “It’s basically aggressive cuddling,” she’d joked somewhat innocently on the car ride to Kings Combat Williamsburg. The 37-year-old actress is a seasoned martial artist with a third-degree black belt in hapkido, extensive Muay Thai and jujitsu training, and a background in competitive bodybuilding. In other words, she could flip me in an instant. But her superior combat skills are only part of the problem: O’Brian is also, per a recent Pride investigation, the “sexiest sapphic alive,” with a gloriously chiseled physique made for Calvin Klein ads and swoopy boy-band hair that frames her smoldering hazel eyes. Judging by the online ev

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