Not remotely true. Another evo-psych myth. For 95% of human history women were so lean and wiry that they only menstruated 4 times per year. It's fine to recognize that modern men find these traits you’ve named attractive, but only when you also acknowledge that at different times in history (and even different US eras) different things were considered beautiful and desirable. For example, in the 1920s, flat-chested women with boyish figures were considered most desirable. Same for ancient Egypt.
William Lassek and Steven Gaulin, anthropologists from UC Santa Barbara, have reviewed the research on body shape, attractiveness, and fertility. As well as waist-to-hip ratio, they looked at the impact of body mass index (or BMI).
Men tend to prefer women with very low waist-to-hip ratios (whose waists are much narrower than their hips), but these women are actually less likely to conceive than women with a less pronounced hourglass figure. Younger women are more likely to have an hourglass figure, and age is related to fertility, but the most attractive waist-to-hip ratios are generally found in women in their late teens, whereas women’s fertility tends to peak in their mid to late twenties. (emphasis mine)
