I have the reverse situation in a way. My therapist swears quite frequently, always in relation to what my OCD might be saying to me, or what my self-critical voice might be saying. In life outside therapy I very rarely ever curse, but in therapy it has felt more accurate sometimes to curse. My previous therapist also cursed(and she was a Protestant minister!!), and at first I was surprised, but then I started to find it helpful. Essentially telling the OCD "F-- You!" is sometimes necessary for me.