How can I cause male infertility?

No vascectomies, no illegal drugs, no "male pill". I want to keep it quiet from my fiancee until i am ready to have kids in 6-7 years.she is anxious to have them now.

I read a study that said if you soak you testicles in hot water for twenty minutes (I think) every day that it would drastically lower your sperm production, and temporarily stop it. The website has ways to stop infertility, but just reverse it. Source(s): http://www.suite101.com/article.cfm/_inf...

Sorry but i dont know of any ways other than the ways you have mentioned, couldn't you just take a male pill and not tell her about it?
Keep your weenie in your pants and out of hers.
You know, I never thought of it...you guys don't have much other than condoms which are a little obvious. :) Sorry, looks like you might have to comunicate your wishes...probably the best thing anyway.
1. If she wants to have kids and you don't, I would suggest telling her that. Second of all, I would be careful. It doesn't sound like you want to be permanently infertile, which could happen. Smoking lowers your sperm count, but doesn't cut it off completely. I would suggest talking to your fiancee about this, because if she's trying to get pregnant and you lie to her about your fertility, she won't be happy. You could be completely abstinent, but that doesn't sound like it is in your plans.
You can cause infertility by telling your fiance the truth. You will only be causing yourself more drama and worry than necessary if you try to hide it from her. There is no other alternative to infertility except abstinence. If you aren't ready...you aren't ready. And if the relationship you have is based on deceit...it will come back to haunt you in the end.