Oh dear, if this drug proves effective, people that would otherwise have divorced one another, will choose instead to remain together in a mutually monogamous relationship. This in turn will naturally encourage them to procreate and spawn a string of children, a dire act that would continue to further strain the rapidly diminishing resources of a planet that is already afflicted by the scourge of morbid over-population.
I'm not being an alarmist now, am I?