In terms of health outcomes talking about your bowels movement, preferably with photographic evidence, would mean that many types of cancers of the digestive tract would be caught early enough to be treatable. As opposed to the current system where you will more than likely not notice the trace amount of bleeding that are symptomatic to most of them.
I have yet to see anyone seriously propose tackling this, even though in terms of death rate all sexually transmitted diseases taken together are only half as deadly as stomach cancer alone.
I've heard one person who migrated to Germany as an adult say it's because German cuisine features all kinds of sausages which can give you stomach parasites. But I might be paraphrasing this story to the point it's inaccurate.
I hope your source was joking with you.
I am still not convinced that I enjoy the gentle splashback as the stool hits the vastly over-generous lake of water in most public toilets :-/
Are you familiar with the paper napkins rolled up so tight they look like a peppermint, and when they get wet they unfurl? Maybe American toilets should have a jar of those things next to it on a shelf so you can quickly drop one in and go on with your business :)
For extra vintage meme, they should be shaped like sea shells.
I support sex-positivity. It does not require one to like it (I know asexual sex-positive feminists), but to believe that all consensual, in-good-faith practices are fine. We may not be interested in them at all, or personally find them repealing, but it shouldn't be different from not liking a particular food.
Vide "10 things sex-positivity is not" (https://everydayfeminism.com/2016/08/10-things-sex-positivit...). Among other points:
"7. Making Other People Listen to Your Sex Stories."
(Which goes both ways, so you don't need to like hearing others' sexual life details.)