The only time I find a womans body shape to be unnattractive is if she has made herself unhealthy to get to that point. And the signs are usually pretty noticeable. Other than that, whether naturally skinny, "perfectly proportioned," thick, curvy, whatever... Its all beauty to me. And even the girls that starve and purge themselves.. I dont feel disgust towards them, more like empathy and pity and sorrow for their non-existant self esteem.