Because it brings all the boys to the yard? Damn right! It's better than yours! Some songs seem to have no purpose at all, but we listen to them anyway. My personal favorite pointless song is Lip Gloss by Lil Mama.
Guilty pleasures, dude! They're songs we think don't have any objective merit to them, but we enjoy them anyway. They're like candy: no nutritional value, but they still taste sweet. Why deny it?
Oh please. Goodnight Nurse has WAY better milkshakes than Kelis. Not to mention it's sung by dudes, and that's... that's just lovely.