Teens don’t know better even if they should.
It takes years and lots of experience to appreciate youth is wasted on the young.
That said, she didn’t deserve to be raped and I’m not at all defending Reed here.
She was 19, so only barely still a teen, and certainly legally an adult responsible for her choices. If she really was raped, it’s a shame, but I have trouble believing anyone is really stupid enough to go marry the man that rapes them on the first date.