I think religion controls sex rather than love and that is to ensure paternity. That's why they allow polygamy, because you always know who the mother of a baby is, but you cannot know the father.You're encouraged to love everyone, but pick one to breed with and you marry them to show this is the person you've picked. The whole thing is geared towards ensuring the paternity of future children in the only way possible which is to stop women having sex with more than one person. Religion, like me, believes it is important for people to know who their father is, though for slightly different reasons.
Nowadays, we have almost fool proof ways of having sex with multiple men and ensuring paternity, so it's moot. People just seem to have forgotten why it used to be so important and hae got wrapped up in the propaganda used to prevent cuckoos in the nest.
IMHO of course.