I understand that Slaanesh is the god of excess, but why is it that pretty much every Slaanesh army concentrates purely on sex, drugs and rock 'n' roll? (if you play noise marines).

Why has no one made an army of really fat marines being led by a daemon chef?

Or what about a 'bling' army (chav/ rapper style)?

Also, why does sexual perversion = s&m? What about furries, foot fetishists, those people who dress up as babies or japanese school girls etc?