From the Department of Unsurprising Discoveries:

The Chronicle of Higher Education discovers, to its dismay, that college students evaluate their professors for superficial reasons:

* GOOD-LOOKING PROFESSORS consistently outscore less attractive
ones on student evaluations of teaching, a new study finds.
--> SEE http://chronicle.com/jobs/2003/10/2003101501c.htm

Ratemyprofessors figured this out some time ago, and included "pepper" ratings on its website so that lovestruck, vengeful, or disgusted students could express their views on whether professors were "hot or not". Mercifully, they do not add up and display negative "hotness totals".