"I think he can find a lot worse available on the Internet these days," she tells PEOPLE. "I think people make such a big deal sometimes about it, when I feel like it just comes down to how you raise your child and how you explain things to your kid."
As for how she'll talk about the spread with her son, she says, "Evan and I will have that conversation someday."
"I don't have one [magazine] cover up, period," she says, calling it "hilarious" that anyone would decorate their home with photos of themselves. "I mean, I don't even have my Rolling Stone cover up. It's like, who wants to look at themselves? I don't. Seriously, the only picture I have up of myself is one of a shark eating Evan and me."