Monogamy is not just a good idea in the sense we often hear about democracy or capitalism, with it being the "best system among many flawed choices." From a purely sexual perspective, a deeply committed relationship is the best way to explore all that human sexuality has to offer. The opposite approach is to merely skim the surface, and changing the topography might seem like a reasonable way to overcome familiarity. It's much better, though, to truly dive in.
Different Drummer: Don Ellis