Disclaimer: Very important for Parents and even children who can understand this post.
My visits to China taught me many things in identifying the gender differences. There are many places where the waiters are transgenders. You see all kinds of people on the road.. Hookers of the fairer gender and even trans-aggressors of the confused gender.
My Chinese Interpretor and me went to a food joint and we found many transgenders taking orders from us. I could not identify whether the waiter was a he-she or a she-he or a he or a she. That is when, my chinese interpretor came to my rescue. She asked me to focus on the neck of a person when we are in doubt about their gender.A boy would ofcourse have an adam's apple.
So next time, even if a silicon implant confuses you, just focus on the neck of the target person.
Everything will be clear.