You think a woman that can't get laid does'nt exist?
5 syllables: neurofibromatosis. It is the most ugly, disfiguring genetic disorder known to man. You will run away in fear, or possibly shoot a woman walking toward you with this condition.
A deformed woman with healthy skin is a 1/10 on the Decile Chart. A Lizzy Vasquez will still get laid, because of men's thirst.
Only a woman with horribly disgusting lesions covering her entire body can't get laid. Though there are cases of women with more 'moderate' symptoms of this condition that have successfully been involved in romantic relationships and have even borne children (despite the disorder being hereditary).