Im not having kids.I hated being a child, pretty much every day and made up my mind that it would be selfish to inflict that on another generation. This has probably had an effect on my relationship status (ie non existant). Some of its down to money, lifestyle, job security , difficult parents, but its not just me, my brother is the same, although he has had girlfriends. My sister had twins and they drove her mad for the first year and she ended up in therapy. Its better now they are 8 year olds as at least you can hold a conversation with them.
I dont see the problem with not having children.
You get to do what you want , when you want, and not have to worry about school choices , stroppy teenage angst, drugs, sex , violence, knife crime , alcohol abuse, whos bullying who in the playground, what colour trainers are in this month etc taking kids away on holiday and they wont want to go, like little miss sunshine.