There is, however, some evidence that sexual satisfaction correlates with educational attainment; for instance, those who completed graduate school express greater sexual happiness than those who dropped out of high school.
Only intelligent people have lots of sex. 
mnli hypothesis: Only intelligent people have lots of sex.  premise: There is, however, some evidence that sexual satisfaction correlates with educational attainment; for instance, those who completed graduate school express greater sexual happiness than those who dropped out of high school.