A MUSCLES The movements your muscles make are coordinated and controlled by the brain and nervous system.
Answer:
I can help you, First, you should ask is there any transitioning they want to do. I know some people who identify as genderfluid use a binder and when they feel comfortable to come out sometimes they want to chop off the yitties. It doesn't really change the relationship at all. They are still the same person you like/ fell in love with. Just remember to be respectful of their pronouns. Also, BEST thing to do is DO NOT out them to ANYONE. Let them do it.
Explanation:
I hope this helps you and if you have any more questions feel free to comment on this answer and we can talk more.
What do you mean? like resting? or something else?