Here in Future World (glorious Nippon), we civilized human beings press a button and have a jet of warm water (or cold, if you prefer) sluice away accumulated faecal matter in mere seconds. It may or may not also have a pleasing stimulative effect on the male clitoris, I wouldn't know (my mangina remains untested and virginal).
Afterward, a mere pat down with a sheet or two of Kleenex's finest is sufficient to ensure that one's cheeks do not chafe. Lovely jubbly.