I believe that sex and sexual urges are not wrong, only the illegitimate expression of them outside of marriage is.
I believe this is ordained for our own good.
Why should I want to have sex with someone whom many other people have had sex with, when I can have greater emotional satisfaction within a monogamous relationship with someone whom I am sure loves me, and whom I have myself chosen to be my wife?
Why should I want to have sex with someone whom I KNOW has no love for me, who only wants my money or worse, is being forced to have sex with me under threat of death or violence, in order to enrich someone else?
Why should I want to do this knowing it will greatly hurt the person I love the most in this world? How can I say my heart is in the right place, that I still love my wife, when I do this kind of thing?
Note that this is my head speaking, the one on top of my neck. There is another head between my legs which speaks a different language. Fortunately I have a choice which head to listen to, because I am a human being and not an animal, which is the point dkw is trying to make.
I believe that there are many who have made this choice, and have stuck to it, whether by their own willpower, or the willpower given to them by God.
Here's some good advice:
Drink water out of your own cistern and running water from your own well. Why should water flow out of your spring? Why should your streams flow into the streets? They should be yours alone, so do not share them with strangers. Let your own fountain be blessed, and enjoy the girl you married when you were young, a loving doe and a graceful deer. Always let her breasts satisfy you. Always be intoxicated with her love. Why should you, my son, be intoxicated with an adulterous woman and fondle a loose woman's breast?
This next part is also important, and I have chosen not to leave it out:
Each person's ways are clearly seen by the LORD, and he surveys all his actions. A wicked person will be trapped by his own wrongs, and he will be caught in the ropes of his own sin. He will die for his lack of discipline and stumble around because of his great stupidity.