I really am interested to know the psychology behind why so many women seem to be throwing themselves at teenage boys nowadays. I'm sure some of this went on back in the day but certainly not to this extent.
I'm going way out on a limb here but here's how I see it:
This is girl is decently cute. Maybe she wasn't at all in high school? And maybe now that she's back in the environment and sees one of the stud jocks that she couldn't get her first go around so she pursues "him" this go around.
Again, I don't know a damn thing about her, what she looked like at 16, nor the complete situation. But this seems fairly plausible.