They know it. Each of them knows that the other knows it. But as they are young, chaste,and decent, as each wants to keep his self-respect and that of the other,and as love is a great poetic thing which mustn't be shocked, they go several times a week todances and restaurants, to present the spectacle of their ritualistic, mechanical dances . . . If there is no God, only the natural is real. We are the result of chance mutations and natural selection.
Reality is comprised of matter and energy evolved to different levels.
Love is a chemical reaction. It is the sex drive or the drive to preserve the genetic pool as several Duke University students insisted. Reality does not include a real value of love. You cannot get the value of love from matter and energy. You simply have chemical reactions, one of which you like to get mystical about and call love.