They (doctors) absolutely will not snip if you don't have kids already.
It's bizarre, and more than a little annoying...
I *do* plan on having kids, but MUCH, MUCH later in my life than the overwhelming majority of my peers have...Something about being away from your family makes em' anxious to start their own as soon as possible with whomever will oblige them.
Besides, kids are sticky, and they wouldn't match any of my sweet parkas.