Solomon is playing with a lot of word pictures in this passage. Such an approach makes many uncomfortable. In his comments on verse 18, Adam Clarke says,
“How delicate and correct is the allusion here! But anatomical allusions must not be pressed into detail in a commentary on Scripture.”One of the paraphrased “translations” puts this verse in an interesting way that gets at the point being made.
(Proverbs 5:16 CEV) And don't be like a stream from which just any woman may take a drink.Faithfulness and chastity are important to God. Here the reference is to our sex life. Other places it might refer to our leisure and intellectual pursuits. God demands purity.
So? The world mocks. We are constantly bombarded with appeals to compromise. Keep in mind that in some areas, compromise is sin. Walk in righteousness.