1 . Female humans show no physical signs of ovulating . That is an evolutionary advantage to make sure men didn ' t have sex with a woman without sticking around . A man would have to hang out with a woman for months to ensure he got her pregnant . So that point has nothing to do with breast size . 2 . Big breast do not mean you ' re more fertile . They do not signify any sort of better health at all . In fact , if we are going to get super evo psych here , men should really find older overweight women more attractive . Women between 2535 have better outcomes for their child , and a slightly overweight woman would be able to make it through long winters or droughts . I ' m not trying to shame men about liking breasts . I ' m pointing out that almost everything we find sexually attractive is from our culture and has no evolutionary backing at all .