What is C.S. Lewis saying about casual sex in the following passage from Mere Christianity?
Can someone help me please with this? Thanks Joelle. In Mere Christianity, C. S. Lewis writes, “The monstrosity of sexual intercourse outside of marriage is that those who indulge in it are trying to isolate one union (sexual) from all other kinds of union, which are meant to go along with it and make up the total union. The Christian attitude doesn’t mean that there is anything wrong about sexual pleasure…It means that you mustn’t isolate that pleasure and try to get it by itself, anymore than you ought to try to get the pleasure of taste without swallowing and digesting, by chewing things and spitting them out again
What he is saying is that casual sex (or really any sex outside of marriage) is in some way unnatural and against God's plan. He is also saying that engaging in casual sex is harmful to the person who does it.
To see this, look at the metaphor he uses in the passage you give us. It would be unnatural for us to chew up our food and then spit it out. It would also be harmful to us because we would not get the nutrition that we need from the food. It is the same, he says, with casual sex. It is unnatural to separate it from the other forms of union. In addition, it can harm us because it will deprive us of the spiritual and emotional "nutrition" we would otherwise get by having a complete union with our spouse.
By using this metaphor, then, Lewis is telling us that casual sex is both unnatural and damaging to us.