Video Meliora, proboque; Deteriora sequor

Our Holy Father, in his pre-papal book "Love and Responsibility" has some interesting things to say about art and the line where pornography begins. He admits the need for literature to reflect reality and sexuality is obviously a part of reality, even sexuality misused. Really great books are great because they can be interpreted multiple ways, often in seemingly opposite ways - almost to the point where an agnostic can read it and interpret it as "pro-agnostic" and a Christian can read the same thing and think it "pro-Christian". I recall a convert friend who read Percy's "Love in the Ruins" totally differently after he converted and "Love in the Ruins" had absolutely no part in the conversion. Percy was a sort of Christian existentialist, which seems to me almost a contradiction in terms. Don't get me wrong, I love reading Percy, and am deeply appreciative that someone so talented was also a believer - but I wonder how truly "Catholic" his novels can be considered when an agnostic sees them in sync with his/her worldview. I realize the purpose of art is not to proselytize. But this is sort of personal to me since I have agnostic friends who could seemingly be reached by art - they are hugely turned off by a more direct approach - but art that to me is transcendent to them, well...