At Harvard, officially-recognized groups cannot use race&#x2F;gender&#x2F;sexual-orietation&#x2F;religion as a qualification for membership. So, yes, a white person can join the Black Student Association. And yes, a male can join Women in Business.<p>Boy Scouts and Girl Scouts are allowed to exist. But I, myself, think their gender segregation is gross.<p>There are male and female sports teams for the same reason heavyweight and lightweight boxers compete separately: we recognize that there&#x27;s a meaningful difference in type of bodies and so we segment them into different groups for competition. But not that the reason for separation, here, is not gender; it&#x27;s types of bodies.