The helloflo.com ad that recently went viral got people talking about a topic that is highly taboo in our culture — menstruation.

This monthly event is both a biological reality and a cultural rite. And it has a long evolutionary tail, so to speak, separating not only the women from the girls, but the human female from the other primate females.  Continue reading all about it, and watch some amusing videos about men and menstruation, among other things, in my new article on psychology today.com. Hope you will leave a comment there!