CrimzonSamurai
Member
Encourage? yes, but again not mandatory. And again, the vast majority of time, two people have sex with one another, they're not trying to make a kid. Nature's goal is to have a part of the population of a species procreate, not all of the population of a species, because it doesn't need all of that species to procreate for that species to continue.
Close, but a little off. The urge to have sex is a daily one because your specific genes are coded to give you that urge to maximize the potential chance to have offspring. So, y'know the individuals may not be consciously trying to procreate, but the chance they will is why the urge is there.