I get so annoyed with people who complain that there aren't enough female characters or vice versa. I have read loads of boys books and very girly books. They are both just as good and all this feministic hoolaboola. It just annoys me. It doesn't matter what the gender of the main characters are so long as the book is well-written.Well-written books are more important to me then the gender of the characters.
Sometimes, in more female oriented books( for teens especially) I find the problem that sex becomes more of an issue. I don't always want to read about that and I know that a boys adventure story is free of this threat. They often just provide innocent fun. In other words I don't understand what your students are complaining about. Besides its third year university, shouldn't people be growing up?