18 May your fountain be blessed,
and may you rejoice in the wife of your youth.
19 A loving doe, a graceful deer—
may her breasts satisfy you always,
may you ever be intoxicated with her love.
This was written at a time when marriage was primarily about the needs of the families involved. Things have changed a lot since then, the prevailing view today is that marriage is about individual fulfillment. The scriptures challenge both of these views, emphasizing unity as the key to marriage. It is in this context that fertility and joy are bound together in verse 18, along with lasting satisfaction and exhilaration in verse 19.
This kind of unity is by no means easy to achieve, but all who have it claim it well worth the effort. The primary advice of the father to son, here and throughout the collection of Proverbs, is against adultery. But this is not a prescription for prudishness, as these verses reveal, but for the deep and enduring pleasure that can only be found in marriage.