Well... I wash myself AFTER the bath is done, with the showerhead. Other than that, I basically try not to think about it. I don't clean the tub very often.

My filth tolerance is pretty high in general, though. If stuff was floating up out of the drain I'd be like hell no, but since we use a rubber plug instead of a built-in one, it's just whatever's on the surface of the tub, which is soap scum and a bit of dirt and hair. I figure I probably eat that much dirt/hair/soap over the course of the week, so I just... don't really worry about it.

So, I guess my answer is "be more disgusting than the tub," which probably doesn't help.