“We got on really well, but he’s vegan. And I just didn’t feel the spark, so it could never work,” my flatmate said wearily, after another unsuccessful first date. “We’re clearly not compatible.”
For a long-term partner, compatibility is a familiar concept. From Date One, you search for clues as to whether this person is ‘right’ for you—someone who likes the same obscure films, also spends their weekends hiking in the countryside, has the same political leanings, and who could give you a run for your money as the life
