Breasts of human females are large compared to those of closely related primate species,
and they can thus be hypothesized recently or currently to have been subject to directional
sexual selection. Here we show that (1) large breasts have higher levels of fluctuating
asymmetry than small breasts,(2) breast fluctuating asymmetry is higher in women without
children than in women with at least one child,(3) breast fluctuating symmetry is a reliable
predictor of age-independent fecundity, and (4) breast fluctuating symmetry appears to be …