I'm not familiar with sexual aversion disorder, but it seems like it would be worth bringing up with your T, even just to ask whether that's an okay topic to discuss. I think this kind of thing would be within my T's wheelhouse, and she is not a sex therapist. I have talked to her about sex/bodies/reproductive health issues before, and she assured me that it's okay and that she talks to a lot of people about a lot of different things. (Somehow her saying that feels like a challenge to try to shock her, but maybe that's just me...) I do think it becomes easier to talk about sexual things the more you do it.