God created some of us to enjoy sexual pleasure associated with His invitation to us to increase and multiply. You and those who think like you are now telling us that God created a few of us to enjoy sexual pleasure purely for its own sake.
'Natura', means born to or for. We were created man and woman in order to propagate the human race, were this not the case then the ability to procreate would have been superfluous to our nature, not necessary.
In comparing the animal kingdom whose sole instinct is self-preservation, you are quite obviously are confusing the law of nature with the natural law.
If we are honest we are all subject to inordinate or unnatural desires. We humans know via the natural law 'written in our hearts' right from wrong. Because of this we are able to subordinate our 'animal inclinations' for the sake of a greater Good.
Comparing us to the animal kingdom is an insult to our intelligence.