Solomon now uses gentle poetic imagery to paint various pictures for our instruction. Each one follows the same structure, using the same formula to express it.
Human desire achieves its goal but then always wants more. Immorality grows in its appetites; the drug addict ceases to be content with what he had before, and man in his lusts always wants to break new ground, to invent new sins. If we are on board the train of fallen human desire, we will find that we are more and more out of control, and going faster and faster towards destruction.