I got a vasectomy when I was 25. It took a lot of effort to get it done, and some doctors took an attitude with me ("You're not married"; "You're too young"; "You don't have children"--duh, that was the whole point--, "You might regret it later"). Later in life, my second wife wanted a baby--I told her she could get artificially inseminated, which she did, had a baby which was legally mine, and I still have my vasectomy to this day. It was the best life decision I ever made--I never wanted kids.

I'm going to go out on a limb here and suggest the very name appended to the profile--quimninja--would be enough to put any thinking woman off.