I have been in WHFB/40K for almost 18 years. Chaos player first and foremost. Managed to gather pretty much every Chaos lore book out there. It is very clear that Slaanesh has never been GW favorite god, so to speak. Nurgle and Tzeentch have a coherent philosophy and I would even use word theology for them. Khorne is relatively straightforward. Of all Chaos gods, Slaanesh is the only one of infinite possibilities, which is quite paradoxical given how Slaanesh has been treated in WHFB/40K/AOS. That is to say, Slaanesh has been the neglected one since day one. Over the years, I read and saw explorations of Slaanesh by various fans and while most were below average, some were excellent. That is the thing with Slaanesh, a good dosage of creativity is required to truly make Slaanesh shine.
I did not pull that perfume/fragrance idea out of nothing. Years ago, I read a blog where one woman was writing a incredible lore for existing but also completely new daemons and mortals, with accompanying artwork for each hero, unit and monster. In her own words, she took a concept, in this case, the olfactory sense, and explored it in context of Slaanesh. I curse myself for not saving her lore and art, for she deleted he r blog and I was never able to find it again. Slaanesh is a deity of everything, for everything can be taken to excess.
But to give a example that all of you can read right now.
A Slaaneshi Kurnoth: http://hgpowell.blogspot.com/2014/05/the-woods-of-bloody-thorns-slaaneshs.html