Growing up in Australia, it was more normal to attend single gender high schools than it is here. I went to an all-boys school, and we were often reminded that at university, you’ll have to get used to the reality of integration. Strangely, the United States does the opposite: More students attend co-ed primary and secondary schools, but in college, students tend to segregate into fraternities and sororities — or, in Harvard’s case, single-gender final clubs.