Dual Income No Kids (DINK) refers to couples that are not tied down by responsibilities that come with parenthood. We enjoy the freedom to do what we want, many times spur-of-the-moment. We prefer not to answer the question, "Why don't you want children?"
You do not have to be married to join the group, you could be a SINK. However, this is not a dating meetup. We are simply adults that chose not to have children and don't want to stay in because our friends couldn't find a sitter.