Julia Serano wrote The Whipping Girl, which was turned into a film starring Eddie Redmayne, if I recall correctly.
Lavery is an academic at an American uni I believe, teaching English literature I think it is. They've just written a book about their penis.
You could try Anne Lawrence who has written extensively about the issue. They are also a transwoman, with a little more honesty, I would say.
Having listened to so many men who say they are women, there's not a single part of me that believes in an inner gender. I haven't seen any narrative that supports it. Quite the opposite.
i'm not saying every transwoman is driven by the fetishisation of women, but it's clear to me that sexism is at the root.
it's quite common to be told that an inner gender is personal and difficult to define. The problem is, that even the people who have one say the same thing.
For something that's so important, that occupies their minds almost constantly, and who must have a unrelenting internal monologue about it, they are singularly unable to give you a single word to describe any of it, that doesn't completely rely on stereotypes.
If you're serious about wanting to find out more, ask any trans person to describe what they think makes them the opposite sex.
What is even dafter, is that this internal feeling that no one can describe, that not everyone has, that can change weekly, or even daily, or can stop entirely, is simultaneously so relevant and important that it trumps biological sex when making laws, recording data, and segregating the sexes!