Walters and his wife have been together for 17 yearsCourtesy of Matthew WaltersMatthew Walters, 56, has been with his wife, Orna, for 17 years.They knew they didn't want kids before they met.People react differently to Matthew's decision to be child-free than they do to Orna's.This as-told-to essay is based on a conversation with Matthew Walters, coauthor of "Getting It Right This Time: Break Free from Your Hidden Roadblocks to Lasting Love." It has been edited for length and clarity.On our first date 17 years ago, the woman who would become my wife talked a lot about kids.