Bleeding after intercourse was thought to be proof of an unbroken hymen, and thus, proof that a woman had not had sex before. The reality.
She was a virgin when she got married and always wondered why she didn't bleed are barely visible (like this image of unbroken hymens).
The hymen -- a deeply misunderstood body part -- looks like a fringe of tissue around the vaginal opening. If a girl uses a tampon does that cause her to lose her virginity? It is not an intact piece of tissue draped across it.