It is much more simple, and less risky.
But it is not meant to be something you can do, then change your mind about.
I'm sure you can find other sites just by googling the word "vastecomy reversal" (that's what I did), but here's some facts.
Vasectomy Facts.
As you can see, it is expensive to reverse, and while they will find sperm in your ejaculate, that doesn't mean you are going to find enough to ensure a easy conception. In addition, the above site was the most opimistic one I saw about the chances.
Think of it as trying to sew back together 2 wet strands of spaghetti, each with a small hole in it, so that the holes line up perfectly.
Do you want to explain to some as yet unknown woman in the future how her chances of becoming pregnant are greatly diminished because of something you had done 15 years ago?
Just wear a condom.