I can perfectly empathize with the old Roman fascination.  What comes out of our lower end openings is self-montored as any aspect of our health.  Was our bowel movement complete?  What was the clean-up after it like?  Probiotics make things neater.  Fiber produces its own shapely results, satisfyingly tubular, a working-out of the things taken within our own individual systems.  How was said volume expelled, enjoyably, suddenly, comfortably, with relaxation, with burning or not, such we keep track of.

Coffee, an enjoyable high, produces burning, as does hard alcohol.  Green tea soothes, and for some systems sparkling water.

The curiosity has a healthy outlet, not that any of it is habitually included in discussion.

Dogs, honest creatures, express interest in each other in their own native way.   The usual check of a colleague will reveal who the dog is, where the dog is from, what the dog's diet is about, how the dog's health is, and even what the dog's mood is.

As with any interest in health, the human mind turns to its usual focus, the sexual.