"that is not my fucking job. If she does not give a fuck about her appearance then why should i."
Because YOU are the one who cares if they're skinny!
Fuck everyone who thinks "I want XXX but am not willing to do the work necessary to get it..."
If you have exotic tastes (a woman into incest) AND care about a body, then pick an older chubby who has the right tendencies, then dominate them enough to get them to work out and be in shape so they can please you. Chicks DIG pleasing their man, and all they want is an excuse to sweat off the pounds and be physically worshipped. You'll both love the results - I did! Got this bitch off the couch and into the gym, now she gives everyone boners but she's all mine to fuck, including her kids of course...