Has your T offered any help with this? Such as clarified with you who wants sex and who doesn't? And how those parts who don't want sex might absent themselves (go to their safe place inside, take a nap, etc.) while others participate?
The belief that sex is required to feel close to someone is something I find next to intolerable in a partner. And this belief tends to be quite toxic even when the partner does tolerate the sexual demands it encourages. So, my condolences to those reading this who are in a relationship with someone who has this hangup.
On this topic and many others too the most helpful author I have found is David Schnarch, a sex and marriage therapist. His books are brilliant.