paternity tests are riviting stuff !

what is it about paternity tests that keep us as TV watching audiences in rapture of our screens and shows??? i'm currently watching two shows right now and both of them have paternity tests as major plot points: Veronica Mars and nip/tuck. i know that the probable outcome of these paternity tests will not be nearly as intreguing as watching the process behind deciding to do them, but that doesn't stop me from loving the drama :)