Nikolai Nikolayevich Rukavishnikov, who died OTD in 2002, flew into space 3 times on Soyuz 10, Soyuz 16, and Soyuz 33, in 1971, 1974, and 1979 respectively https://toilet-guru.com/blog/2.html?s=mb #spaceflight #history
Toilets of the WorldNASA's Space Poop ChallengeThe Challenge of Space Toilets — A blog about toilets