time.com/5431836/dna-transgender-history/
An interesting read I thought.
Aside from that I've alway felt that the greatest advantage that human beings have over other species is their ability to make changes and choices that go against their 'nature'. Nature in this case referring to their X and Y chromosomes. Human beings are able to transcend their biology in pretty much every way other than the ability to either carry a baby or provide the sperm to make one. True, DNA can't be altered to change someone's biological function as such, but there is some evidence that there are chromosomal changes in those who go on to become trans. See the above article for a mention of it. So, men can choose to live as women, present as women even have reassignment surgeries to change their bodies to a female form and vice versa. No, they cannot effectively change the biology that was determined after conception - but that doesn't mean that they fulfil the other 99.9% of life as their chosen identity and gender. The reason I've never answered anyone's demands to have their belief that sex is sex is sex and it's predetermined and can't be changed is because I honestly don't get why it makes a difference. Who people are, how they choose to behave and how they live is what counts, as is what language they use to describe it. If transgender people haven't eroded traditional sex roles and the concept of manhood and womanhood as we traditionally accept it in the last 300,000 years I doubt they will manage it now. I just don't see the threat - and it doesn't matter how many times people repeat that they think there is one that is greater now than it's ever been, it doesn't make it true for me. Just as me repeating how I don't buy it doesn't make it true for others.