> Definitely not the case, not in all regions, not even within the same country

Perhaps—but it's also possible that whoever was in the room with the patient declined STI testing (which I have seen, and which sometimes reflects lack of knowledge around extramarital affairs).

I'm just trying to make it clear that there are dozens of reversible/non-degenerative causes of dementia and there is no way that a fully-trained neurologist doesn't have these memorized.

It's like not knowing what a type system is as a programmer with a reputable degree—impossible.

edit: in fairness, many doctors have unease around discussing sex/infidelity—but the PSA maybe should be to encourage your doctor to put aside concerns around niceties in your parent's care.