Because she's a strong, curvy goddess and she deserves a man with a 6 pack and a 6 figure income!!! Seriously though, telling thin/fit people that they need to be in relationships with obeasts would never work in the long run. Either the slimmer partner would become fat from following the obeast's lifestyle of fast food and sitting in front if the TV all night, or the relationship would deteriorate because the couple's lifestyles would be so dramatically different. Could you imagine buying separate groceries, cooking separate meals, and spending so much time apart because the fit person is at the gym while fatty sits at home and whines on Tumblr? And god forbid they somehow manage to procreate, how would you raise children in an environment where the parents' views on health and nutrition are polar opposites? Take note, lurking fatties. Fantasize all you want, but these are the reasons you'll never have a successful, long-term relationship with a fit person.