Pretty sure you know this person more than I would
Postmodern gender terminology is a mess. Whatever impressions you have, there's bound to be a group that disagrees. This means that you're never quite sure what a person's history is based on the terminology applied to them. @Godot - I don't know. I tend to be sceptical of the idea of "universal sisterhood", as I'm sceptical of any claimed mutually exclusive qualities of something like gender.
Didn't say anything about universal sisterhood. but if he was once biologically a she, she could have gotten pregenat. This is not a dis on women who were genetically male once, but it is a reality all women share. Doesn't make it more or less "real", just a shared reality.
Ah, I didn't realize you were talking about the body. Thought you meant something more subjective about socialization.
Nah, purely body. I assume that biological girls who understand and/or present themselves as boys, probably have a deep fear of rape, since it seems to be a "common" punishment that our oh so healthy society does when it finds that someone who is self-presenting as a boy, has a vagina.
I'm not one to quibble, but "biological girl" isn't the preferred term for most trans men, at least for most of the ones I've read of and those I know personally.