Children.

No children would make me feel like my life ultimately has no lasting effects and I want to be remembered - like many others. Having one child would suck. Three could be hard to control and makes me feel like I'm only making the population issue worse. Two would be fine: Distribution of genders isn't important, so long as they don't suffer Only-Child Syndrome.

I find the idea of marriage intriguing, but not the idea of children. I don't think I'd mind being a DINK. I really suck with kids and I have no idea how to entertain them or have fun with them.

Teach 5 year-olds Python. Yea.

for males its a vasectomy. i plan to have one myself, though note that there've been cases of guys legitimately getting a girl pregnant after having the procedure so note its not a 100% never-gonna-have-kids pass. really the only advantage id say to it would be if you have one and you meet a girl, and about 2~3 months down the road she says she's pregnant with your kid.

>Implying neutering is done on females.