Matthew Henry on Proverbs 5:15-23

Enjoy with satisfaction the comforts of lawful marriage, which was ordained for the prevention of uncleanness, and therefore ought to be made use of in time, lest it should not prove effectual for the cure of that which it might have prevented. Let none complain that God has dealt unkindly with them in forbidding them those pleasures which they have a natural desire of, for he has graciously provided for the regular gratification of them. 'Thou mayest not indeed eat of every tree of the garden, but choose thee out one, which thou pleasest, and of that thou mayest freely eat; nature will be content with that, but lust with nothing.' God, in thus confining men to one, has been so far from putting any hardship upon them that he has really consulted their true interest; for, as Mr. Herbert observes, 'If God had laid all common, certainly man would have been the encloser.'-Church-porch. Solomon here enlarges much upon this, not only prescribing it as an antidote, but urging it as an argument against fornication, that the allowed pleasures of marriage (however wicked wits may ridicule them, who are factors for the unclean spirit) far transcend all the false forbidden pleasures of whoredom.