Retifism - the scientific explanation

An off-blog comment from my ultra-clever psychologist/art buddy :

“Regarding the whole "shoe" thing, you've missed the neurobiology approach :-)
If you look at a brain map, which shows how skin touch senses mapped on to the cortex, you'll notice that the sense areas for feet are physically extremely close to those for the genitals. Some neurologists have suggested that the foot/shoe fetish might come about if the person has some extra close interconnections between these adjacent brain areas.”

Wow. Well that explains Retifism then.