. >> reporter: as for erika anderson, she recently celebrated her one-year anniversary. >> has your relationshipf changed pre and post wedding ceremony? >> i feel like it has. looking at my relationship to dating because it is an open marriage. >> because you're still open to dating. >> yes. >> so even though you are enough and you're fulfilled alone -- >> right. >> -- you're stilling willing to have someone else join your space. >> yes. absolutely. yes. but i don't have to have it. >> reporter: for now she says she's happily married, and this is certainly one marriage that won't end in divorce. >> if someone else here be so lucky to marry themselves. >> reporter: in new york i'm linsey davis for "nightline." >>> next, counterterrorism expert richard clarke on the most catastrophic threats being ignored today. beneful grain free is so healthy... oh! farm-raised chicken! mmm...that's some really good chicken. i don't think i've ever tasted chicken like this. what!? here come the accents. blueberries and pumpkin. wow. that was my favorite bite so far. not even kidding. i mean that was... ...oh! sp