splendid moonlight

They say men are attracted to women with wider hips because it's a sign that the woman is more capable of child-bearing than their "smaller-hipped" counterparts. But according to this maternal and child health nursing book I'm reading,

"Some women look as if they have wide pelvis but, in reality, have only wide iliac crests and a normal or even smaller-than-normal internal ring. Other women appear as if their pelvis will be small because the iliac crests are nonflaring, ...