I guess the college would have had a real problem if the gay men were very sexually active with heterosexual men or with women.
Casually throwing out an anecdotal guess that gay people are more college educated because of all the sex they're having is frankly shocking to read.
If you're not intentionally discriminating, at the very least you're stereotyping the amount of sexual activity of people based on their sexual orientation and your anecdotal experiences.
Jump on grindr and see how long it takes to get a hook up vs tinder.
In Toronto gay bath houses greatly outnumber the only one straight bath house, and there are zero lesbian bath houses. This seems to corroborate your theory.
The point is that these types of stereotypes have been, and are still being used today, to discriminate against gay people. Casually suggesting it's true and using it to explain subsequent actions of gay people, with no data or evidence to back it up, is just going to give more fuel to the sterotyping and discriminating that's going on.
Where's the data? Is it just gay people who have lots of sex that are more likely to hold a degree? Does this hold true for straight people? Do I need to have sex 3 times per week to get a college degree or can get by with just one per week?
You're just making assumptions about gay people sexual habits.
As far as the article goes, Harold Bloom (the western canon guy who died a while back) argued that gay and bi people are significantly overrepresented among great writers and poets. I'm not sure if he had a theory as to why.