"I said, 'Why would I want to be in Playboy?'" she tells People. "I just didn't want to look perfect. I didn't want to have to change myself to be attractive. I didn't think that was my responsibility."

The actress, whose new show CSI: Cyber premieres Wednesday on CBS, says that while it was "powerful" to show how she aged over the course of 12 years in Boyhood, she doesn't want to constantly talk about how it is that she appears in front of the camera.

"I've had so many of these conversations in my life...what I look like on film, what I don't look like on film," she says. "What are we supposed to look like? Men are not having these conversations."

"It's like we're trapped in wet wool or something," she continues. "I just want to be free of it so we can move to the next level as equals. Not that I don't love being a woman, not that I don't love the differences between men and women. I just mean, as an actor–why is this a conversation? Why is aging a conversation? It's a one-sided conversation because it's only ever had by women."