No I agree, it's definitely not an uncommon rule.
So is Prof's "emotional indiscretion" with you going to lead to you and he not being able to have a relationship at all?
It sounded like that was how the rules and their penalties worked.
Prof and S seem to have a thorough list of restrictions, if the list even covers pee-pee-ing. Oh wait, that one fell under the BDSM umbrella.
Is there a thread about BDSM rules/restrictions? Must be quite a read if there is!