Loveless marriage: ridiculous argument for having an affair

This thread refers to a scene in the drama Yangotonaki Ichizoku  where the man is trying to show that "his marriage is loveless, due to which he has affairs with different girls outside."

You can't have a loveless marriage, but you can have loveless s3x. This is a very ridiculous argument people make to escape their mistakes.Now many people will say that emotions are not required for s3x, which is true to some extent. 

then Tell  straight up that you want s3x and you are not satisfied with just one person. There is no need to give absurd arguments. The problem is in you and the world is to blame

Let’s be honest: you’re avoiding responsibility, struggling to trust anyone, unable to truly respect those you care about, and finding it difficult to give or receive love.