“[Charles] Darwin said, ‘If you have four children and I have no children, you live on and I die out.’ So it’s not how much money you make. It’s not how good looking you are. It’s not even how smart you are. It’s how many children you have. How much of your own DNA you pass on to tomorrow," Fisher says. "So parts of the brain are simply built to go out and find a lot of different partners, focus on just one at a time, fall in love with that individual, attach, then remain attached at least long enough to raise a child through infancy together as a team.”

This deep-seated link between love and survival explains our cultural pre-occupation with mating, for better and for worse.

“People live for love; they sing for love; they dance for love; they compose all kinds of myths and legends for love. But they also kill for love and they die for love. So love is a tremendously powerful brain system. In fact, I’d call it an addiction - a perfectly wonderful addiction when it’s going well and a perfectly horrible addiction when it’s going poorly.”

And like any addiction, love can cloud our judgment, lending credence to the line in that old Elvis Presley song that when it comes to love, “only fools rush."