My partner and I are very much in the wanting to be Child Free camp. I've never been maternal, never been interested in children at all. I've watched as my friends have had them and seen their lives flip upside down, it's only confirmed my stance to me.
A good friend and former boss and I were talking about it once, he has two grown up children, and he told me you'll regret it either way. If you have them you'll have days you wished you didn't, if you don't you'll have days you wish you did.
I just know I'd much rather be sat with the regret of not having them, consoling myself with a guilt free hangover/lie-in/spending spree. Than resenting a child who's here because of us. I have lots of pets who I adore and we both have our own hobbies which are expensive and time consuming which I can never see either of us giving up. We check in on it every few years, make sure we're still on the same page. So far, so good, I can't see it changing ever.