ABOUT a decade ago, Cindy Gallop, a pixie-like businesswoman, said she began dating and sleeping with men about half her age. While their stamina and her experience made a good combination, Ms. Gallop said, she also discerned a disturbing trend: the boudoir moves of many of her young lovers seemed drawn entirely from pornography.

So Ms. Gallop, now 52, an advertising executive turned Web entrepreneur, took her findings to a TED conference in 2009. Easy access to Web sex sites, she told them, is teaching younger generations “that what you see in hard-core pornography is the way that you have sex.”

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