1. No bra in bed.
2. Don't get a boob job (I went to see a plastic surgeon before we met, to talk about facial feminization and boobs. I almost certainly wouldn't have done it anyway, but EH's objection settled it).
3. Be a boy sometimes, too.
And, most important: respect her preferences. In other words, when she asks me "Can you go in boy mode tonight please?" I will always say No Problem.
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(In case it's not clear: we go out together as 2 girls regularly. She has no problem with it whatsoever as long as it's not in a situation where, for instance, her former in-laws might make an appearance.)