Whilst you are still hanging around here, it would be really interesting to hear your point of view regarding both transwomen in sport and also the strong arguments about protecting biological women's rights. What lines would you draw, if any (and lets try and keep out of toilets - it over-excites a number of people here!)?
If one sets out one's initial argument on the premise that without trans women in sport, that can be taken to mean that sport is then guaranteed to be fair, then one is overlooking all that has already known, not only the nature of sport but all other forms of competition.
Each sport is affected by their combination of determinants relevant to the nature of the sport. These factors include speed, precision, flexibility, agility, physical strength, ability to withstand a training load, and fatigue resistance in the event.
Far and away the biggest contribution to success comes from one's parents. That is to say, the content of ones genes and the resources that ones parents put behind growth and development. A child raised in hunger will never have the same potential for growth and development as one who is not.
A child born to Dutch parents will have advantages when compared with say Peru. In the Netherlands the average height of a female is 170.7cm with a stature ratio between men and women of 1.08. In Peru the average height of a female is 151 cm with a stature ratio of 1.09.
Does a girl born and raised in say Afghanistan have the same potential for sport as one raised in the USA? Does a child born and raised in a country where the state intervenes to select and sponsor children for sporting prowess in international competition for the glory of the state have an advantage?
Advantage and disadvantage comes from the accidental circumstances of one's birth. This is so well known that it is referred to every day in every day language: ''the apple never falls far from the tree'' for just one example.
I happen to be a 'tidy' pianist, but then monkers was a very good pianist, which is hardly surprising since her father graduated from the Royal College of Music in piano. monkers (the lack of the initial capital was her choice - rather like bell hooks) always owned and maintained a good piano. To this day it has been carefully regulated and tuned.
I had lessons all funded by monkers, and I had the right conditions to practise. Accordingly many of my friends play instruments, and we frequently play together. When we discuss top-flight musicians, we tend to use the same phrase and then laugh, ''they went to all the right places''. This is in recognition of our own privilege, and recognition of the fact that there are those elite level musicians who have more talent and had more privilege.
One has to remember that elites will almost without exception do their bit to protect the elites - it is never solely about innate talent.
When Laura Trott married Jason Kenny, it became inevitable that any child of theirs will have advantages, both natural and as a result of privilege.
Now to the thorny question - do trans women have advantages in sport? The answer has to be that it depends. It can not be the case that going through a male puberty is the only one factor - but it is without doubt a factor that is more significant is some sports than it is in other.
A child born xy and raised in all of the societal norms of the associated gender, by probability will have advantage. If we compare two children born and raised under the same circumstances, let's say unidentical twins, one boy and one girl, and they are raised in their associated genders, there exists a high probability that the boy will outperform the girl in some competitive sports, but the girl will outperform the boy in others. In sports that are less sex specific, such as say hockey, boy's performance is likely to be superior to the girl's - but still not guaranteed.
Testosterone plays a major part during child development when a foetus, and again post puberty - but not during the gap in between. Despite this boys usually out-perform girls. This indicates another disruptive factor to the assumption, that being xy is the only or prime cause behind superior performance. Studies have shown that the differences stem from parental and societal expectations. So again girls have a disadvantage.
Hormone levels in men and boys are fairly constant across any given month, for women and girls hormone levels are not, which is another disruptor - much to do with sex, but not so much to do with bone or muscular development.
I guess I must reiterate some small points about myself. I am a trans woman, and despite this I don't know my chromosomes for sure, since there were never tested to my knowledge during my transition. I will have to assume that I am xy. In my everyday life, this means nothing to me or to others; it is invisible and unknown, and a non-issue.
I did not go through a male puberty, I used puberty blockers until I was prescribed cross-sex hormones. I am barely half an inch taller than the average height of women in the UK, but shorter than both monkers or my mother or their younger sister - all three being taller than their brother. I have a small frame, and the curves that you would expect of a woman. My testosterone levels are zero, so less than those of an xx woman of my age.
Do I have any advantage in sport. I will say not. Not just because it suits somebody in my position to say so, but because I have no prowess in sport whatsoever - there is no family history of any of us enjoying any level of success in sport. I have played sports like table tennis, ten pin bowling, pool, badminton with friends. They rate me as on a range between ''useless'' to ''pathetic''. They don't like to play me at scrabble.
The bottom line I think is this. If an xy competitor was raised as a boy, went through a male puberty, continues to have a testosterone level in the male range then their potential for success when competing against xx women is obvious, because they likely have the physiology and likely they were raised by parents and society with the expectations that fit with being xy male. Therefore I fully understand and support those who say that people should not be able to simply self-identity a gender and with that gender the associated sex. When we compare average levels of performance on as near a like to like basis, we can assume that there are differences likely to favour one person over another.
In conclusion then, in order to make sport more fair, we first have to realise that it will never be fair - it will be necessary to consider the sport itself, the level at which it is being played, and the history of the person. That leads to two choices in present binary thinking - ban all sport, or strictly divide competitors who are not strictly xx or xy. Is either of these a solution that is fair - in my opinion, absolutely not. The no sport solution is not fair to either competitors or those who like to spectate. The strict xx or xy solution, is not a solution because it still does not produce anything like a level playing field in sport.
In short, whatever is proposed or enacted, the elites will continue to dominate in elite level sport.