I read about the trials of figuring out how to use the bathroom in space were actually pretty terrible until they sent women to space. Basically they tried a number of solutions like condoms. Anyways all of them would usually result in getting covered in piss. When they finally sent women to space they decided on diapers being the best option, not long after that the men on the missions demanded their own diapers when they saw how easy the women had it. I've also heard from interviews with astronauts, there's a secret rule among them. never eat a floating chocolate.