Take some oxytocin

.. and you'll feel much better: More frequent sex and more attention to breasts, Dr. Young said, could help build long-term bonds through a “cocktail of ancient neuropeptides,” like the oxytocin released during foreplay or orgasm. Researchers have achieved similar results by squirting oxytocin into people’s nostrils — not terribly sexy, but it seems to enhance feelings of trust and empathy.

But watch out: Suppose you took that potion and then suddenly felt an urge to run off with the next person you spent any time with, like your dentist? What if you went to a business convention and then, like an artificially stimulated prairie vole, bonded with the nearest stranger?