Acupuncturist Pham Thi Hong managed to free three convicted rapists with her Virginity Detectin'® method:
"They all had small red spots on the back of their ears," said Hong, 54. "The spots should have disappeared if they had had sex. My many years of experience told me that these men did not have sex before." [...]
She says she was first taught how to determine if a man has ever had sex by feeling their pulse. She later developed the ear-spot method on her own. She says the spot will only disappear after heterosexual intercourse and is not affected by gay sex or masturbation.