Assertion: masturbation | /r/HasProperty | american doctor benjamin rush
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text: Ley has stated that the website is a continuation of the anti-masturbation movements from the past, such as Swiss doctor Samuel Tissot's 18th-century claims that masturbation was an illness that "weakened the male spirit" and led to immorality; American doctor Benjamin Rush, who claimed that masturbation caused blindness; and W.K. Kellogg, who developed corn flakes as part of his anti-masturbation efforts.