(Unascended) Astarion* very clearly initiates sex when he is ready. He also clearly voices that he enjoys being kissed.
Please excuse me, I'm not sure if I understand your post. I love to talk about Astarion and I'd love to talk about him with you but I'm at a complete loss, what your point is. Would you mind to elaborate?
*can't speak about other companions because I haven't romanced them.