Sex is the food of carnal love. But it is sex for one's self, not a sharing or love making. Carnal love is not bad or evil. It is natural, as are the other kinds of love. We must be aware of it and not confuse it with other kinds of love.
Carnal love is a shadow of romantic love.
Romantic love is the second kind of love. Partners in romantic love give and take from one another, they satisfy one another, they share between themselves. The highest expression of romantic love is making love, as opposed to simple sex. Making love is differentiated from simple sex in that each partner's objective is to satisfy the other not only one's self. Satisfying the other is as important, if not more important than satisfying one's self.