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In page Prostitution:

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Since the 1980s, buyers of sex have increasingly been the object of academic studies and political debate, signaling them as the reason why prostitution exists.[citation needed] Swedish researcher Sven-Axel Månsson studied their motives in "Prostitution".[2] US researcher and anti-prostitution activist Melissa Farley compared sex buyers with men who do not pay for sex in a 2017 study.[3]