my two cents (or even a quarter)..
Why mens toilets aren't smelling like ladies toilets?
Think about it in "nature" way - it's a relic of human animal background. Animals (male ones) are marking their territories with smells, they simply pee on something to tell other animals (same specie(?)) that this is their terrain - look why your dog isn't peeing in one place, but is doing it here, and there and over there, and so on (not talking bout female subjects).. This would be the main reason, but think about it - everyone's scribbles get flushed away - in the boys and girl's room. So why?
The second reason is: when we(men)'re doing our stuff in the toilet, it is done on "standing" position. Now, imagine a waterfall, and the nearest surroundings. - for those who "didn't catch" an illustrating sight - when a 'string of urinates'(!) hits the bowl, some of it' spreads to invisible mist falling everywhere around.. (don't flame me for this - it's true!)..
That is why I think it is how it is..
:-D