It isn't every girl. That said, the were some articles written in the Washington Standard that suggested this was somewhat of a common practice for elite DC insider children back in the day. My guess is CBF thought she had LK as a witness, but LK had to backtrack because of financial issues or people possibly coming forward impugning her character
I was being sarcastic, and do not believe that a college girl would want a high school boy. As a freshman, all the freshman girls wanted to date older guys.