The first paragraph of their About Us page says:
NO KIDDING! is an all-volunteer, non-profit social club for adult couples and singles who, for whatever reason, have never had children. It is not a business or a dating service. We rely on all of our members to volunteer some of their time to organize our activities. NO KIDDING! is not allied with any sect, denomination, political entity, business, organization or institution, does not engage in any controversy, and neither endorses nor opposes any cause. We are a social club -- nothing more, nothing less.
They have many local chapters. I've joined the two nearest chapters to me, but they do not seem to be very active. Other chapters seem to have more activity. But I thought I'd let ya'll know about it if you don't already.