A daily pill called Addyi is the first medicine to be approved for the purpose of boosting women's sexual desire. Allen G. Breed/AP hide caption

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The experimental drug flibanserin, made by Sprout Pharmaceuticals, is at the center of a regulatory controversy. Allen Breed/AP hide caption

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The Colorado Rush, a gay rugby team in Denver, at practice. "I've always thought of myself as ... the rugby player that happens to be gay," says Skyler Meyer. "I never want to be the gay man who happens to play rugby." Luke Runyon/KUNC hide caption

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Johnson with her fellow researcher and sometimes husband, William Masters. The pair helped legitimize the study of human sexuality. AP hide caption

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A male fruit fly (Drosophila melanogaster) Jan Polabinski/iStockphoto hide caption

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