The level of detail is up to you: Ts often follow the clients lead, but will sometimes use sex-specific language as well to help the client realize this is a normal topic to discuss, not shameful, not traumatic in itself, just human.

So, it's up to you- you could be very vague, and say that X causes you difficulties with "intimacy" - or, you could go middle of the road and talk in clinical terms about the difficulties, or you could be very graphic and specific. You can absolutely talk nuts and bolts in therapy, my therapist uses specific language as well as emotional language, talking about the pleasure and difficulties as well as the individual sex acts, for example, but it's entirely up to my comfort level-

she adjusts to match my needs.