We all go for looks fundamentally. I wouldn't believe any guy that says he wouldn't go for a good looking girl because she only had a high school education. It reminds me of the 2/10 would not bang meme.
Yeah it's so obvious. Take a look at the wives of very successful men, so men who have lots of choice between women. Not many ugly women there but quite a lot of variation in education level.
e.g. all of the ladies Tiger Woods, or David Letterman, etc., was cheating on their actual wives with. The President of the US used to sleep with famous figures like Marilyn Monroe, or occasionally chubby interns.
Jude Law married the model / actress Sienna Miller... but got caught sleeping with his kids' fairly plane-jane nanny.
You marry on your level to be around that person, but that doesn't mean you're not sleeping with cocktail waitresses and bar floozies.