Part of sexually sane living is realizing what is at risk when we begin having sex outside the bounds of our marriage. Here we have a reference to where our seed as men will go when we decide to begin committing adultery.
The father tells his son not to have his springs dispersed abroad - like streams of water in the streets. The picture here is how a man's seed should be kept for his wife - and only his wife. When a man begins committing adultery and resorting to women who do the same, he is risking pregnancy with a woman who is not his wife. Unfortunately we have myriad examples of this in our current day. Men, who do not care with whom they have sex, wind up impregnating women who are not their wives. Thus their seed is like a spring dispersed abroad - like water in the streets. The result is a society where there are illegitimate children running around - without fathers. A man who does such things is a man who will have his name and his reputation damaged over time. Since he does not care for the children properly they tend to go astray and to cause problems. When people learn that they are the illegitimate children of a man - that man's name suffers greatly - as do the children whom he has sired - but does not rear for God.
God says to let our seed by ours alone - and not something that is shared with strangers. God intended for a man and a woman to be married, then to share in sexual intercourse. It was never His intention or will that men should have multiple children with multiple wives. This creates very serious problems over time. It causes problems for the family - for the husband and wife - for their children - and for the child who is uncared for by a father later in life. There is also the problem of what happens to the woman who is used in this way. Quite often this woman grows very bitter and angry at the man who has used her for sex - but is unwilling to commit to her . . . or to her child.
God knows the damage that comes from ignoring His Word and the principles upon which it is based. This is multiplied many times over when a man fathers illegitimately. Unfortunately most men do not even consider such things - they are looking only for the pleasure of the moment rather than thinking about the long-term affects of their immorality. That is why it is left to godly fathers to warn their sons of such things. May we be wise and do such things with our sons and daughters - to hopefully promote a little more sexual sanity in our world.