It's all about communication shorthand
It is easier to say, "Mina went shopping today" than to say "I dressed up enfemme and went shopping today." Four words instead of eight, and we all understood what was being said. Frankly I think this is a non-issue unless the s/he in question truely has a split personality or is using this as an excuse to "do bad things" enfemme because they "are really a different person" when dressed enfemme.
One set of data, two modes of expression
(spoken from the masculine perspective): One day my wife and I were having a discussion involving her interest in my opinion on a number of issues. Three hours later my wife was speaking with Tina and asked for opinions on the same issues. My wife explained that she thought Tina could have different opinions....those from a feminine perspective.
Tina is my feminine self. She does have different tastes in food and in wine. She is incredibly fastidious. She really enjoys dressing well, and would never think of working in the garden or any other task involving actually soiling her clothes..not a chance! She likes chick flicks. She has her own crochetting projects and she is interested in books I would never read. She is also left handed while I'm right handed. Her voice is different. She gossips with my wife (or chit-chats, depending upon your view). My wife says that the next time Tina visits, she'll teach Tina how to be bitchy (whatever that actually means!).
Tina has only existed in our understanding for 4+ years. My wife and I understand that she has always been with me and it is fascinating to us to find out who she is. I spent my whole life hating Halloween and any form of play-acting as I was completely uncomfortable leaving what I thought of as my self image. Yet, one day Tina shows up, my wife is buying her a dress and makeup, and suddenly it all makes sense. Also, my wife's relationship with Tina is girlfriend...I am her husband. Tina and I work off the same data base (knowledge and experience) but Tina is committed to being feminine and that takes separation.
This whole separation has helped me to understand a number of things that have been ambiguous in my life, and has brought my wife and I to a closer understanding of each other. It may be the case that Tina and I will merge back together, but somehow I doubt it. I like the freedom that the separation bring to Tina and me.
Tina and me...us!