I can imagine a future generation where gender fluidity becomes
a side-effect of human life expansion [physicists make
everything spheres, so a genderless human would be a logical
result].
and at around the age of 4 years old, children are asked by
their caretakers to chose their gender. Little 9xj2.997a.alpha
picks up the annoyed Thomas the Train and points it at
caretakers face.
[1]no
"But honey, school is starting soon. You have to choose."
9xj2.997a.alpha picks up toy train again.
etc.
References
Visible links
1.
http://icopiedyou.com/wp-content/uploads/2015/08/no.jpg