I am actually trying to understand the logic of the trans movement. They seem to think that humans come in with two different biologies: biology A (with ovaries etc.) and biology B (with testicles etc.) however, "male" and "female" is totally independent from what kind of biology you have. This actually makes sense, though,  if you listen to their logic. as if gender identity is completely separate from biology, then trans-surgery wouldn't be meaningless, no? since such surgery seeks to change biology in order to mark a change in gender?