I can't speak for all therapists but I'm sure mine would be amenable to my own rules, as long as they were reasonable, of course. We haven't discussed rules either way (although I'm sure she'd tell me if I crossed a boundary) so I'm just speculating here. If I did make some rules, I'd probably ask that she not touch me without asking, not talk to my psychiatrist without letting me know (even if she tells me afterward that's fine), and not check her phone during session.

(FYI my T doesn't do those things! But if I were to make rules for any therapist those are the first ones I can think of.)