Maybe you don't need a partner but you do need some connection in the world. I think that overcoming cPTSD likely does require some attachment or at very least some kind of investment in building a life. It sounds like your T might be lacking in skill and certainly it sounds like a poor fit. But I wonder if T is suggesting that you venture out and seek connection with others and you're hearing "have sex."

If a major source of your self-hatred and isolation is that you don't like being gay, it makes sense for your T to try to address that with you. This is not necessarily about having a sex life but about being able to connect with others--which can be very challenging if you're drowning in self-loathing.