How do you find and choose one special person from a world of potential mates? Some say that the key lies in the human brain and the way it is wired for romantic love, sexual attraction, and the need for attachment. The desire to give and receive love may compel us to look for the ideal life partner, but finding the right one can be difficult. Still, humans were choosing a single mate with whom to bond long before Kabir, the fifteenth-century Indian poet, wrote that “the road of love is narrow.”