Defecation rule
With this in mind, I hereby establish the defecation rule: A defecator is at liberty to commit the act, but he may not commit it on his neigbor's doorstep or in the quiet street in front of his neighbor's house, or in his neighbor's alley, or in his neighbor's customary place of work, or any place where the neighbor or any other passerby may step in it by accident in his own zone of privacy and tranquility.

From Sheri S. Tepper: Six Moon Dance, page 32.