Allowing children to watch porn? What age were you exposed to porn?

One of my friends allows her 12 year old to watch porn because she said that she wants him to be aware of sex & to know "how to please a woman" when it's his chance. I'm repulsed and disgusted by this because outside of this, she's a really great mom. She said because she grew up in a home with parents that didn't censor anything (television, music, pornography, adult books, etc..) that she wants to pass that down to her children. I don't think it's appropriate honestly. Let kids be kids.