The thing that can stretch or tear when a girl first has vaginal sex is the hymen.
Understanding the Hymen
The hymen is a thin membrane that surrounds or partially covers the vaginal opening. It's important to note that:
- Variability: Just like other parts of the body, hymens are different for everyone.
- Stretching: The hymen can stretch open the first time someone has vaginal sex. According to the reference material, this stretching might cause some pain or bleeding.
- Not Always a Reliable Indicator: The presence or absence of a hymen is not a reliable indicator of virginity, as it can be affected by activities other than sexual intercourse, such as exercise or tampon use.