There is a lot more to the human body than sex. It's just the one thing that society is obsessed over.

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.