My wife and I choose not to have children around 2005. We do normal stuff that doesn't involve having children:
1) Travel
2) Work on Self Improvement --workshops, clubs like toastmasters
We both still have jobs, but I would like to be a speaker and have my wife be my manager, booker, travel agent, business partner.
I really love craft beer, in moderation of course, and my wife loves to shop.
I suppose if there was a population shortage, we might reconsider, but I don't see that happening.
We both like our lives without kids...it just took us a while to figure out that that having children is not required on earth...it's optional.