How often do you bathe your Sphynx?

I live with a sphynx, but she is my roommate's cat. She ought to be bathed a bit more often than she is, but she's not a super oily cat and is a bit hairier than she should be, which I think aids somewhat in helping her stay clean longer. She definitely favors her Devon rex lineage, with the cute pixy face and the bit of hair that she does grow during cold weather is a rex coat, fine and wavy (and only on her flanks and shoulders, it's quite the sight). Recently, my roomie has been using an emu oil-based pet shampoo on her, which leaves her smelling wonderful and very pinkly clean! How many sphynxes do you have?