er ...why.
what has that got to do with the topic?
Anyway.
Still not sure about the whole single sex school thing. I think it stems from catholicism monk and nun training back in the dark ages,. Though all modern non denominational christian schools that have been established in the 21st century are now co-ed.
Though at universities, an undergraduate degree is still called a Bachelors, though women can study for them, they dont get called Bachelorettes or Spinsters. I think if you stay focused on your studies, the whole marriage thing is unimportant before you graduate anyway. Unless you decide to marry so you can qualify for a student allowance, which was what some desperate students actually have done.