'So ugly that it's cute' is a strategy that works, if chihuahuas and newborn babies are any indication. I don't think 'so ugly that it's sexy' works quite as well. A naked mole rat (_Heterocephalus glaber_) - which, even to my eyes, is probably the ugliest living thing on the planet - relaxes at the beach. Thank Mr. Ruggles for (obliquely) providing the idea.