Not sure what shitlords have do with this, this article is obviously specific to women. Low WHR (waist hip ratio) has repeatedly been studied and linked to increased fertility in women. It's a commonly used measure in both the obstetric and nutritional community. It's also a pretty good measure of a woman's attractiveness to men across practically all human cultures throughout history. The authors demonstrated that women with a lower WHR (flat abdomen/narrow waist/female pelvis so: shitladies) have offspring with higher cognitive test scores (so: smarter). Yeah, some skinny girls may have a narrow pelvis and thus a slightly higher WHR, but no shitlady is going to go above 0.9, unlike some female buttergolems.