Viktor E. Frankl said this quote

“ Love is the only way to grasp another human being in the innermost core of his personality. No one can become fully aware of the very essence of another human being unless he loves him. By his love he is enabled to see the essential traits and features in the beloved person; and even more, he sees that which is potential in him, which is not yet actualized but yet ought to be actualized. Furthermore, by his love, the loving person enables the beloved person to actualize these potentialities. By making him aware of what he can be and of what he should become, he makes these potentialities come true. In logotherapy, love is not interpreted as a mere epiphenomenon of sexual drives and instincts in the sense of a so-called sublimation. Love is as primary a phenomenon as sex. Normally, sex is a vehicle of expression for love. Sex is justified, even sanctified, as soon as, but only as long as, it is a vehicle of love. Thus love is not understood as a mere side-effect of sex; rather, sex is a way of expressing the experience of that ultimate togetherness which is called love. ”