

I think a majority would find that unethical regardless. Majority of Americans, no doubt. Majority of the rest of the world, probably not.
When I was beginning to work at the university, there was a professor who had started an affair with his student. Everybody knew about that, no one cared a s***. Later on, the student got employed at the department, and then they got married. The only thing I ever heard of it being talked about was that it wasn’t quite sure whether it was the student or her professor who actually did her “maturity exam” (a then-compulsory exam after finishing your MA thesis, the questions of which were based on the thesis).
The figures only make sense in “first past the post” (or “winner takes it all”) systems.