The year is 2061. Do to fear of an increasingly sexual society, and new medical technology allowing for quick and easy removal of body parts, laws have been signed into place allowing parents to "protect" their children by having them neutered.
Around the country clinics have popped up that offer cheap and easy nullification for anyone who wants it.
The surgery is permanent. Once your genitals are gone they're gone for good. Your crotch is entirely smooth, to most it would seem you never even had any genitals. The only thing they keep is your ureathra, which is placed between the legs.
Some surgeries go even further. Compleatly reversing the effects of Testosterone or Estrogen. This will remove all secondary sex characteristics, leaving the person completely genderless and androgynous.
You're currently a teen living in NYC whose parents are about to inform them that they're scheduled to go to a desexing clinic in one day...