Maria Fabrizio for NPR

Mountains of "little blue pills" and their chemical kin have transformed the way many people think about sex and aging. Raphael Gaillarde/Gamma-Rapho/Getty Images hide caption

toggle caption Raphael Gaillarde/Gamma-Rapho/Getty Images

If you're interested in buying Viagra, Pfizer, the drug's maker, will now sell it to you from its official website. William Vazquez/AP hide caption

toggle caption William Vazquez/AP

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