At thy right hand there are pleasures for evermore (Ps. 16: 11)
“Whoso loveth wisdom rejoiceth his father: But he that keepeth company with harlots spendeth his substance” (Prov. 29:3).
This is yet another proverb where the parallelism fills the instruction out, giving us quick of bit of extra detail. A son who loves wisdom gives his father joy. That is the first half. The second half is that a son who keeps company with whores is one who is wasting his money.
The first thing we should note is that wasting his money most likely means squandering his inheritance, the way the prodigal son did. The older brother made a point of saying that he had thrown it all away on harlots. Now to throw away an inheritance that a father had painstakingly accumulated over the course of many years is the opposite of bringing a father joy.
We can also see that there is a basic choice set before young men. They will either be keeping company with wisdom, or they will be keeping company women who are easy. A son who is wise is one who can see the end of the story, and not just a very pleasurable first chapter.
The lips of a woman of pleasure are like honeycomb, and her mouth is smoother than oil (Prov. 5:3). But the end of the affair is wormwood (v. 4), that and some grotesque STD (v. 11). Your honor is shot (v. 9), your money is all gone (v. 10), and syphilis ate your brain (v. 11). While it is true enough, that would be a bad time to realize that the problem was that you hated instruction (v. 13).
But a wise son, the kind of son who gives his father joy, is the one who stays away from porn, and everything related to that world in any way.