Stable relationships are like getting socks as a present: They may not be the most exciting gift, but they make you feel warm and fuzzy, and most people want them more than they realize. Of course, not everyone is into socks. Some people find socks stifling, uncomfortable, or even suffocating at times. Some people can deal with socks, but still like to step out in flip flops and sleep barefoot now and then. But for the Myers-Briggs personality types who want a steady partner to ground them, socks are a 24/7 accessory and always a welcome gift. (I could extend this sock metaphor further by discussing the differences between knee socks and ankle socks as they relate to relationship stability, but I think I'm just going to put a sock in it.)
Personality types who prefer stable partners over spontaneous ones tend to have one trait in common: They're usually judging types as opposed to perceiving types, which means they'd rather plan ahead than fly by the seat of their pants. For planners, a stable partner is indispensable in helping them keep their life in order, and for these Myers-Briggs personality types, having a reliable SO isn't just a gift — it's a necessity.