When I was a young grad student, the teaching orientation involved a tiny old Russian professor telling us "Do not sleep with undergrads you supervise. If you feel you cannot avoid this, you must come to my office and say «Dr. X, I think I want to sleep with this student» and I will reassign (1/2)
the supervisees so they are no longer one of yours. This will be a very awkward conversation, but I promise it will be twenty times less awkward than the conversation that happens if I come to your office and say «So I hear you forgot the rule from orientation...»!". This left us all pretty clear.
