When on spacewalks, astronauts wear maximum absorption garments (In English, we call these diapers). This is because it is too time consuming to reenter the shuttle or space station each time the astronaut needs to relieve himself. I suppose that eventually there could be constructed a pressurized environment on the moon, but as of now anyone on the moon [or anywhere else outside of a pressurized atmosphere] is not allowed to say (or even think) any ???? ????? because they do not have a ??? ??? (and, of course, their ???? is not ????).
However, while in the shuttle or space station, they are able to maintain ??? ??? and ????? ?????, so my earlier post responds to the thread title but not the OP.