The act of relieving can be symbolic, ritualistic, superstitious.
Until my arthritic fingers made it impossible, I was a keen bell ringer, achieving a goodly number of Quarter Peals all over Lincolnshire ...... 45 minutes of concentrated mental and physical effort, and dedicated teamwork in a six or eight member team.
The point [I knew I would get there] is that before the first Quarter many years ago, I needed a pee round the back of the church. Thereafter it was a ritual never to be missed.