Slaanesh's appearance alters to the observer's greatest desires, changing eagerly to please and seduce the eyes of the receiver. You don't just appear before some imperial civilian as some crude multi-limbed abomination screaming "I r Raep maashcine!" but rather nudge them down the river of decadence via the ship of lust until they reach the blessed plot of perversion and can't tell the difference between sin and luxury. If you perceive a multi gender-ed figure or mushroom, well that's your fix but Slaanesh normally confines that visual persona of a split hermaphrodite to that of the warp, probally because her followers would go mad to see such a figure or that it doesn't appeal to their desires.
Well no one really sees Slaanesh because it is said any who lay their eyes on it instantly lose their souls and are 100% devoted to it Not really, what I was trying to say is there are people out there that don't care what you look like they just want to sleep with you, I'm not like that, I do care what people look like and call me shallow for it
