Rogina,
I know a couple in that tricky situation , they lived for years in a male to male sitaution now one has fully transitioned , they've stayed together but the male partner is now as confused as hell .
To me a TS is post op , same applies to F/M people .
OK there is no denying gender and sexuality can become very blurred , it really is up to the individuals , if they are happy with their situation and it harms no one else it really doesn't matter .
