Being male in a Dominant/submissive relationship (and I recognize your relationship doesn't seem to fit the standard D/s relationship) is usually not an issue. Lines may be blurry, but gender doesn't usually play a role. The feeling that it does may, but that's an issue with self-respect/esteem and comfort in the role of submissive partner.
This makes me think the submission is a *reaction* - to your history, to past abuse - rather than a healthy power exchange. You used the term "pathologically submissive," which I think is a great way to describe it.
I can so relate to this. Not only with sex, but with other physically painful stuff.
I think there is something to both. I am no longer in a relationship and since stopping the sex and then falling out of the relationship, I have learned so much about the abuse-submissive dynamic (we haven't worked on that specifically in therapy, but it just seems to have come naturally) - and it has not been a happy realization - and I doubt I will ever be involved again in that sort of partnership. The D/s stuff was fun in the moment, but when you're in the moment in a relationship, you rarely see the destructive aspects. And I do think getting older (and wiser?) definitely has something to do with that realization.
I do think there are aspects of submission that are very...hm, healing in a way. For me, I think I've surpassed that. My relationship never got abusive, but I now recognize my need to submit as part of my need to continue the people that were powerful over me as a child.
This sounds like a positive step. I have been wondering if you think you will ever grow out of this relationship?