There is considerable evidence that both falling in love and long term attachment are associated with the levels of various chemicals in the brain. Suppose we learn enough about the process to be able to control it artificially. What might the results be and should we approve?
A couple fall in love and get married. To properly regulate their emotions thereafter, they get a prescription for a few months of "being in love" drugs and use them to enjoy their honeymoon and the beginning of their marriage. Being in love is too intense an emotion for the long term, so they then switch to the "long term attachment" prescription. Later, as their schedules permit, they temporarily switch back in order to experience a second, third, fourth honeymoon...
The new drugs provide a new option—choice of mate not by either our parents or our hormones but by our reason. You employ some suitable search strategy to find a woman who is well suited to be your wife and will think you well suited to be her husband. Once the marriage contract is signed, the final step in the ceremony is for both of you to take your love drugs. You look deep into her eyes ... .
--David Friedman on an implication of advances in psych drugs