In human females cyclic shifts in preference have been documented for odour and physical
and behavioral male traits. Women prefer the smell of dominant males, more masculine
male faces and men behaving more dominantly when at peak fertility than at other times in
their menstrual cycle. Here we examine variation in preferences for body sexual
dimorphism. Across two studies, both between-and within-participant, we show that women
prefer greater masculinity in male bodies at times when their fertility is likely highest, in the …