Sixty percent of college students in America are women; men go to college in fewer numbers. Some campuses are content to reflect this gender gap, but many are not. Most strive for a balance of men and women on their campuses.
The result: boys are favored in the admissions process, sometimes with a 10-20% better admit rate than women.
While we wait for the lawsuit that will reverse this advantage (remember that affirmative action programs based on race are under fire by the courts), we do well to keep this in mind.