Here's another excerpt from the classic book by C.S. Lewis, "Mere Christianity". This passage is from the chapter about sexual morality.
If anyone says that sex, in itself, is bad, Christianity contradicts him at once. But, of course, when people say, 'Sex is nothing to be ashamed of,' they may mean 'the state into which the sexual instinct has now got is nothing to be ashamed of'.If they mean that, I think they are wrong. I think it is everything to be ashamed of. There is nothing to be ashamed of in enjoying your food: there would be everything to be ashamed of if half the world made food the main interest of their lives and spent their time looking at pictures of food and dribbling and smacking their lips.
I do not say you and I are individually responsible for the present situation. Our ancestors have handed over to us organisms which are warped in this respect: and we grow up surrounded by propaganda in favor of unchastity. There are people who want to keep our sex instinct inflamed in order to make money out of us. Because, of course, a man with an obsession is a man who has very little sales-resistance. God knows our situation; He will not judge us as if we had no difficulties to overcome. What matters is the sincerity and perseverance of our will to overcome them.