According to Lexicanum, Slaanesh is, among other things, the chaos god of Perfection. Which brings an interesting question to mind:
Take someone who is obsessed with creating a perfect {thing}, where the quality of a {thing} is diminished if it is tainted by the warp. After that persons obsession causes him to fall to Slaanesh, can he still create a {thing} that isn't tainted by the warp ?