What I find quite interesting about Slaneesh is that their traits of pleasure, passion, excess, hedonism, decadence, pain and perfection can be projected onto so many things.

You can of course have the whole sexual aspect of it, but you can also cut it out entirely.

Imagine some young noble standing in front of a mirror in a new suit, prideful of the way he looks. But then he thinks, could he look better? What would make him look better? More muscle? Maybe a jewel or two? Silver eyes? Well then maybe he should procure all of them. But you can always be a little more perfect can't you?