Why does a boy touch a girl's vagina, just touch without inserting it in

Patient's question:

Why did the girl's hymen break when the boy touched her vagina, without penetrating it? Why

Doctor's answer:

What you said, external contact with the sexual organs will not cause damage to the hymen. However, if you do not want it to happen, you should strictly prohibit such sexual contact. Otherwise, there is no meaning to regret after the hymen is broken.