Epona's very scholarly analysis is right on target -- but I also agree with Larke.
After all, we humans are animals, too... and it would be very strange indeed if instinct and pheromones and evolutionary mandates and genetic memory were not involved in our
"mating rituals," as well. We humans have language, though, so we're able to come up with a term like "making love" rather than simply calling it sex... and by doing so, we elevate it, in our own estimation.
So we consider that humans woo, rather than force... write poetry to seduce one another, rather than execute standard rituals like tail-thumping and nest-building... and we think that we must be driven by something more lofty than "mere instinct."
But I suspect that, beneath all the layers of meaning we humans assign to it, our own desire to bond and mate and procreate is driven by the same
fundamental instinct. And there's nothing wrong with that -- except when our animal instincts overwhelm our human reason, as in the case of that astronaut who drove to Florida to confront her romantic rival!