Love is as primary a phenomenon as sex. Normally, sex is a mode 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.
Viktor E. Frankl, Man's Search for Meaning
philosophy, psychology