[wpietri]

The short answer is horniness. They are hoping to get some. And indeed, as I understand it, they've received what they think are explicit photos of someone else, so they believe they are in a reciprocal context.

If people were all that good at being rational about safety in the face of possible sexytimes, it's true this wouldn't happen. And we wouldn't have STDs or unintended pregnancies, either. But as the man says, life finds a way.

[user_7832]

To add to the fact, these are teenagers. They already aren't well known for rational thought or low levels of horniness.