Having low body fat is attractive for both sexes, and it's not a cultural or environmentally learned thing, its instinctual. I remember learning in school that in several ancient cultures, fat women were seen as attractive and that the only reason men desired slender and fit women is because of modern movies and television. Of course this is bullshit, because by fat what they really meant was women with big tits and asses, and that's not fat. There is not a culture in the world in which a ham planet with a flat chest and flat ass and rolls is considered hot as compared to a woman with a flat stomach, fit body, and ample curves according to taste.