The only way to be a woman is to be born female.
No x-ray vision needed. Female people are highly likely to be able to correctly identify the sex of a male person.
Here is a study done on faces
https://www.sciencedirect.com/science/article/pii/S004269892200133X
Our results indicate that facial structures with full information on the texture and color of the skin are correctly classified as to their sex by most of the participants (98.4 % for Exp. 1 and 94.6 % for Exp. 2). If we do not consider versions 3 and 5 (close to the androgyne version 4), which contain a certain degree of sex ambiguity and only consider the less ambiguous versions (1 and 2 for male faces, and 6 and 7 for female faces), the accuracy approaches the ceiling (99.9 % for Exp.1, and 99.1 % for Exp.2). This is in line with previous research which observed that natural faces, devoid of any cultural signs of sex, are generally correctly categorized into their sex
I would think that results over 90% indicate a correct assumption that most of the population can accurately identify the sex of humans from faces. However, note the difference between people correctly identifying male versions of faces vs female.
The study mentions other papers as well.
For anyone interested, Amy E Sousa has done some videos on the recognition of sex category in humans.
https://www.theknownheretic.com/p/instinct-sos-sex-recognition
Amy Sousa is a Depth Psychology specialist. Meaning she has studied and she teaches about human instinctive behaviour.
I recommend any person who doesn’t believe that humans are likely to correctly identify the sex of other humans particularly female people recognising male people, might like to watch this.
And Q-angles - Just one of the many key differences between male and female body cues.
If you believe in fair competition, Emily Bridges should not be racing Laura Kenny
Owen Slot, The Times, 29th March 2022
https://archive.is/u4oSa
^www.thetimes.co.uk/article/3081c8c0-af7c-11ec-8b8c-0207c0fd6104?shareToken=dfc4c5b36b407a8e0ccc2133e718b121^
"Biomechanically, though, she still retains distinct advantages. The athletes she will be competing against have naturally wider hips. For the purposes of powering a bicycle, the crucial element here is that they will have a wider angle between the hips and the knees — this means their quads do not work so efficiently in transferring power."
Crucially, it is these angles that are quite important in understanding who is a male person and who is a female person when looking at gait, stance and other movement. All without judging a person's body based on whether they are 'woman' enough.
No x-ray required.