Then explain to me why one goes out of their way to dress like a man and act the man role. Let me inform you I have lots of Lesbian and Gay Friends. The Butch's act the man/male part.
Wow. That must be Texas-thinkin'.
Not ALL lesbian couples do the "I'm the guy, you're the girl" roles.
In fact, I'd say most of them do not.
Just as male couples do not "play both parts" in the way they act or dress.
If a lesbian is a girl who likes girls, why would she want her partner to dress and act like a guy?