What's the etiquette on having a crap in front of someone?

I don’t like colonics. Never have.  Took my first one purely in the name of research because I figured I couldn’t slate something I’d never tried. ‘You’ll love it,’ said my pal Sam. ‘You’ll feel great afterwards, all clean and glowing and energetic.’So I duly went and had the crap taken out of me by somebody in Mayfair, if I recall, and it was deeply unpleasant and I felt like…well, crap afterwards.
But it’s an intrinsic part of the detox process here at Ti Sana so…when in Rome… (or...