I'm guessing mine was the first or second appointment because the inital session is an assessment and often the 'contract' is covered which often includes how you and your T will work together, limits of confidentiality, what happens if you turn up late or fail to turn up to an appointment, fees, times, contact out of sessions etc - these are all types of boundary issues so the word could be used there.

I don't like the thought of the word but at the same time its to protect us and them, no matter how much we don't like it.