Modern life has enforced the idea that couples matter more than single individuals. For a start, when you are on your own, you Tend to get less invited to friends’ parties. It’s nothing personal; your friends are just worried that you may feel awkward in a room full of couples. There may be something true in it, but in the end, this can make you feel pretty down. And it shouldn’t. More importantly, couples tend to Travel more often than singletons, which is a little unfair. After all, how are you going to meet your soulmate if you never go...