@Space Pants I've often asked those questions myself. I'm starting to think maybe it's an unspoken yet accepted part of astronaut culture. Remember when Lisa Nowak made the news? Something tells me wearing diapers outside of their necessary, mission critical time frames isn't the least bit uncommon for these men and women. I mean, once they get over the initial taboo of using their diaper, which I'm sure they all do, they probably realize how comfortable and convenient they can be. I know I've personally spoken to more than one person who wore due to bedwetting during their youth out of necessity but still enjoys wearing into adulthood. Now by choice rather than necessity. As far as NASA goes, that's an interesting question that we'll probably never really know the answer to. If I had to guess, I'd bet it's a don't ask, don't tell kind of thing. I'm sure they're given an ample supply through restocking vessels.