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In virginity tests, the presence of a hymen
is often used to determine if a woman is a virgin. Another form of virginity tests involves testing for laxity of vaginal muscles with fingers (the "two-finger test")
The only physical evidence you have of virginity is a hymen and not all girls have those since they can break every easily. It would not show up on a pelvic scan since the hymen is just at the opening of the vaginal canal and a ultrasound
don't go that far...