Love may be an unpredictable feeling, but it is far from impossible to describe with numbers. "The Book of Odds," released in January of this year, shows the surprising probabilities governing everyday life, including how your sex life stacks up. Whether single or attached this Valentine's Day, flip through these slides to see how you stack up. May these odds -- of finding love and getting laid -- be ever in your favor!
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Sarah Gray is an assistant editor at Salon, focusing on innovation. Follow @sarahhhgray or email firstname.lastname@example.org.