Why do we play? And why it is attractive?! | Science News | Scoop.it
From epistemophil.wordpress.com - October 7, 2012 7:53 AM

Playfulness in males signals that they are not aggressive and would not harm the mother and the offspring. So females would prefer playful and harmless males. And playfulness in females signal health and fecundity, according to Professor Chick. On this basis, adult playfulness seems to be attractive to the opposite sex.