you can think of it like this - a mask is like a kleenex condom. or a sheepskin condom, perhaps. you may want to reduce the risk, but if your condom is worthless, why bother?

if you want to, whatever.

but, if you're out there fucking everybody you see with a sheepskin condom, thinking you're protected, all you're really doing is spreading disease. if you knew better, maybe you'd be less confident - maybe you'd take better precautions, be a little more discriminate.

and, forcing everybody to wear a sheepskin condom when they have sex would be flat out fucking insane.