I am also part of a quad. As couples our friendships started as neighbors, then friends, then best friends, then we hung out together all the time. Last year something happened no one expected and since its has been a blur. Both marriages solidly monogamous and now... not so monogamous (polyfidelous). Until a few weeks ago I had no idea what Polyamory even was!!! LOL OUr situation can only be described as "beautiful", full of ups and downs but built with love and trust. Being neighbors has many advantages... gives us the closeness we all want and the privacy we sometimes need. We have the same problem we are always together even with our extended families... we cannot come out in public either. To protect each other its best to keep it a secret but its not easy... once small innocent mistake is all it takes.