I shower every day because my hair is oily as hell, looks awful when I wake up, and will start smelling about 36 hours after the last shower. :( In any case, I don’t use soap except on the areas you mentioned. It's really not necessary if you use your hands to lightly rub and scrub while in the shower.

I ask anyone who reads this to continue and shower every day. Specially if you take public transportation or sit in a cubicle farm.