I am a 24 year old female and just let me say that doctors are not likely to work with a woman wanting sterilized unless she's over 30, already has kids, or it's necessary medically. I think it's crap, as it's the woman's body, but that biasness is how it usually is. (You can Google child free friendly doctors, I was able to find a few in my area but don't have the money for the procedure.)

There are certain risks that come with getting ones tubes tied. It's actually much less risky for a guy to be sterilized, and the procedure isn't half as invasive. It's also much less expensive and for some reason males don't endure as much biasness.

So if you are ABSOLUTELY SURE YOU NEVER WANT CHILDREN, get a vasectomy. If you are still weary she can also be taking birth control, although I think it would be more of a comfort than a necessity. My fiance and I don't want children, oh how I wish he'd agree to a vesectomy. It's gonna be me getting fixed. ;(