I always loved Gloria Steinem; this Cosmopolitan interview is enlightening.

I particularly like this observation about the popular myth that young people are experimenting with sexuality in ways that older people, somehow, never thought about:

Miley Cyrus has said, "I am literally open to every single thing that is consenting and doesn't involve an animal and everyone is of age." So it's sort of the "I'll try anything" generation.

Seems like an extreme lack of taste. Sometimes I think a threesome is the two women are really in love with each other and they need the guy for permission. The question of who really wants to be there is a fundamental question. Who genuinely wants to be there? Who feels they have to do it for approval or to keep their partner? In my life's acquaintance, I haven't actually known of three people, all of whom equally wanted to be there. I have faith that it might happen.

http://www.cosmopolitan.com/career/a48037/gloria-steinem-advice-memoir/

The way she has of never flinching at criticism, countering it well, and being a strong advocate for unpopular ideas is always something I really admired about her. And she's not afraid of being smart.