Unfortunately sardis is right. It is an evolutionary adaption and not just modern man. The same holds true for the apes.

Males are attracted to females that have characteristics indicating the are fertile and capable of producing and raising healthy offsring - i.e. healthy, young, women with large breasts for feeding and wide hips for bearing.

Females are attracted to males who are capable of engendering children and providing for and protecting them as they grow. Muscles means strength to protect, round butt = strength to fuck, status means ability to protect and access to resources means ability to provide. So in modern terms, muscular older men with status and money.