http://www.dailymail.co.uk/news/article-1163338/Children-dont-make-happy--says-expert-doesnt-any.html
Of course, we don't have our say because we don't have crotch fruit...
Here's my answer:
I don't have children, because their presence doesn't make me happy. They are noisy, messy, annoying, needy. Oh, and please, don't say: But you were a child once too, what if your parents didn't want you, who will take care of you? These stereotypes were all used up already, they are called bingos. For more information on answers you are not allowed to use, check http://7deadlysinners.typepad.com/sinners/2006/04/breeder_bingo_c.html to see how predictable you are.