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<p>Some people believe that these places are great because they are single-sex and provide a unique environment, appealing to a self-select group of students who made a very deliberate choice. </p>
<p>If they became co-ed, their niche would change. They may still be special, but not as unique, and they would attract a different sort of student. They would be different places. Some of them might not have any niche at all, but would become just another of the hundreds of small liberal arts colleges which feel somewhat indistinguishable to outsiders.</p>
<p>There used to be more all-male colleges out there, but too few students wanted to attend them. Fortunately, your son still has some choices available if he really wants an all-male environment (and they’ve already been mentioned here). </p>
<p>For all that, I’m not sure the slight imbalance between men and women on most co-ed campuses campuses really makes that much difference to the college experience of the students there.</p>