The first kind of love, the most base, is carnal love. Carnal love satisfies our primal passions. It is a self-gratifying love, like narcissism. Carnal love is self-perpetuating. It thrives off our emotions, it demands satisfaction.
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.