Your response to the "Do you want kids?" thread is one of the best ones that I've ever heard.
However, there are other ways to stop yourself from having children. The first one off is to have all of your male reproductive organs removed, & the second is to stay away from girls at all times.
Either of those options are fine with me, but with the amount of zeal in that post of yours, I'm sure that you'd like to have your male organs removed at one time as well.