One of the things I admire about my friends who are in same-sex marriages or relationships is how they navigate these roles openly and at a practical level. They talk about how to divide up housework, swap out who initiates sex, both can lift heavy boxes, both express emotions. Once you remove the ability to revert to stereotypical gender roles, couples can have a frank discussion about many subjects. I can certainly see how someone who is trans would have a different preference on these roles. In my experience, however, many CDers enter into more traditional relationships in an attempt to conform or "cure" themselves. That can make changing these roles more difficult.