For people who have one, the hymen can be easy to detect. It usually lies within 0.8 inches (1-2 centimeters) of the vaginal opening, creating a partial boundary between the external and internal genital organs.Feb 24, 2021
So, with that information, a lot of authors need to learn that if your MC inserts half his cock before encountering the HYMEN, he does not have the equipment to call it a cock.