"Are humans completely lacking in our animal instincts at this point?"

I would say not. Just when people are conditioned from when they're a child to not explore sex in any way, especially for religious reasons, it would override their instincts.

"It's nice to see people so innocent."

How is such extreme ignorance nice? How is not knowing how to have sex innocent? That kind of implies that sex is something wrong. I REALLY don't get that attitude at all. If they didn't know how to go to the bathroom, or dress themselves, would that be nice and innocent too? Sex is a natural part of human existence. I don't think I want to know why you think it's innocent. Sometimes you people scare me.

"I am concerned with the bigger questions concerning human fertility and its rapid demise in the west and Europe."

The reproductive system is very sensitive. More pollutants = less fertility.

"Perhaps it's possible that humans, as the leading sentient species on the planet, are able to transcend basic instincts sometimes?"

Someone who tries to "transcend" intrinsic parts of their humanity is a fool, as far as I'm concerned. Instincts are not inherently bad. Why should we be without lust? Would that be better? Would we be more desirably innocent?

Some people seem to think this is a good thing. I find it disturbing. Ok, and humourous.

"I think it's safe to say that in 'higher' mammal species, the instinct for sexual behavoiur is reduced."

No. The only difference is humans have sentience to counter it. And as you can see, we use it to keep the population down. Oh wait! We don't. But that's a rant for another soapbox.