Isn't it ?
Although technically I make fun of girls personally, us guys are only required to be strong and slim with well built bodies, why ? because that would ensure the health of the child, the girls however play the cockatrice's part, making themselves look as beautiful as possible within certain limits to grasp our attention with their sexy bodies, boobs and makeup + clothes.
Of course there also often comes personality issues, so a fair amount of guys will also look at manners and behavior in overall.
Basically, life's a circus. Everyone plays their part in it.