Some even believe that the pair bond, far from strengthening communities (which is both the prevailing view of social science and a central tenet of social conservatism), weakens them, the idea being that a married couple becomes too consumed with its own tiny nation of two to pay much heed to anyone else. In 2006, the sociologists Naomi Gerstel and Natalia Sarkisian published a paper concluding that unlike singles, married couples spend less time keeping in touch with and visiting their friends and extended family, and are less likely to provide them with emotional and practical support. They call these “greedy marriages.” I can see how couples today might be driven to form such isolated nations—it’s not easy in this age of dual-career families and hyper-parenting to keep the wheels turning, never mind having to maintain outside relationships as well. And yet we continue to rank this arrangement above all else!
This is a long—and a bit long-winded—article from The Atlantic, but the above was an especially interesting idea and one I hadn't come across before. I have no idea how supported it is, but it seems worth considering. There are more lesser-known ideas in the article if you have the time to peruse it.