I IZ SICK OV DEZE MUDDER FUKKIN SLANIKIES, IN DIS MUDDER FUKKIN FRED! WUN OV YOUZE, EKKSPLAIN WOT SLAANITTY IZ ROIGHT NOW OR I'Z GONNA 'AVE A STROKE!
I'm sorry Ork, it's a matter that you cannot comprehend. It's simply things that do not exists in your collective unconscious that you are able to wrap your head around. I'm not saying specifically it's too complex, it's simply something that an Ork would not consider or bother to comprehend.
The Eldar were once a bit to eager to create offspring, this eagerness resulted in the creation of a god of eagerness. That is really all there is to it, and it is not like we have any troubles with her, at all. Our troubles with her are like the Squats, non existent.
No troubles with Slaanesh, I am sure. Surprise! On scale of One to Isha, how screwed are these poor bastards? And finally something for you Harlequin lovers out there.