Nope.
"Pictures of what appear to be a 17-year-old engaging in sexually explicit activity do not in every case contravene community standards," the court said.
"The (Act) also prohibits speech having serious redeeming value, proscribing the visual depiction of an idea -- that of teenagers engaging in sexual activity -- that is a fact of modern society and has been a theme in art and literature for centuries."
The opinion cited several artistically significant instances in which teenage sex was portrayed, including William Shakespeare's play "Romeo & Juliet," and the recent movies "Traffic" and "American Beauty."
Kennedy was joined by justices John Paul Stevens, David Souter, Ruth Bader Ginsburg and Stephen Breyer. Clarence Thomas wrote a separate opinion agreeing with their conclusion.