An exert from my digital journal that I keep since I want to contribute to this topic but don't want to retype everything lol. I've thought about this very topic for countless days.

Love is selfish because it is nothing more then an evolutionary illusion designed for our survival and to get us to procreate. If a child didn't love and respect their parents, his or her survival chances would diminish because the parents would be more likely to abuse or abandon the child. When a couple formulates a relationship, the love between the two isn't unconditional; it's similar to a mutual business transaction where both parties benefit. When a couple “loves” each other, they generally desire to have children to pass their genes on.

Without love, procreation wouldn't be possible and we would be extinct as a species.