Personal space
"Personal space" in a Sentence (2 examples)
It is customary, moreover, for those sharing a cabin to while away train journeys chatting on the two bottom bunks, which is likely to jar with many Westerners' narrower conceptions of personal space and ownership (especially if they have paid top dollar for the prized bottom bunk).
Like long-term couple Helena Bonham Carter and Tim Burton, who famously live in separate houses, I believe that personal space is the key to a healthy relationship.