Women avoid the hard sciences in university. (That's not as true as it used to be, and a larger percentage of technical professionals are now women.) So, it seems likely that as women in uni tend to slide into the Humanities and all that bullshit, one is given the impression that they prefer to study lit. It's still true that if you want to meet ladies in uni, take a course like literature or sociology; you're much more likely to sit next to a drop-dead BABE in those courses than in DiffEq.