I can't really answer your question, but I have been thinking about it and came up with a thought. Men usually know when a woman is into them. It's called feremones (???) We give off an air, unconsciously. A look, a smile, a laugh. We posture ourselves differently. Given the intimacy of the therapeutic relationship it makes sense that T would pick up on this stuff. Especially since T's look at the whole person, how your dressed from week to week etc. I had a T once tell me he knew I was depressed because I hadn't been wearing earrings for a couple of weeks. They see stuff before we say it, powers of observation.