Hmm - mine's kinda similar:

When are you going to have some kids?

I don't want kids, I don't feel responsible enough to look after myself, let alone a small child. I love my independance, I love not being woken at 2am by a screaming baby, I love being able to leave things around the house that wouldn't be considered child friendly. That's the pro's.

The cons: Disappointing my family and my b/f's family, and perhaps one day reaching an age where I can no longer have kids then deciding I want them. If I had a kid now though, it would be for all the wrong reasons. The hard part is telling our parents we don't want kids.