My first reaction to that was "What about antibacterial ointments?", so I went and checked...and at least Bacitracin Ointment is made up of Bacitracin, light mineral oil, and white petrolatum (aka Vasoline).

Sooo...not sure about the anhydrous argument, unless the antibiotic present in the ointment works to kill off the sealed-in buggies. (okay, buggies isn't a medical term either. hehe)

Which now has me wondering if antibiotic ointment would make a good lube or would it throw off the buggie balance 'down there'?