He was a strong supporter of testicles grafting. The now-debunked theory that testicular transplant could cause male rejuvenation and age reversal was first proposed in 1889 and grew popular during the 1920s.[5] Stanley performed grafting experiments on prisoners, transplanting testicles from executed prisoners to other inmates. Animal testicles (from goats, boars, rams, and deer) were also used, if testicles could not be procured from executed prisoners.

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