Despite all the advancement of science, having children is the closest any of us can or will ever get to immortality. How is installing a vasectomy going to help fulfill what nature and instinct has brought to all of us?There may come a day when registering a person's unique DNA profile at birth is part of the birth certificate, but I would not want to be part of a society where an infant is presumed a bastard until proven legitimate.
It's only the latest scientific progress which has put us in this situation. Truly reliable paternity tests are a fairly new thing for the human race. Perhaps science could offer a solution for the men who discover they have been deceived by a person whom they trusted with their sperm, only to discover she used sperm from another source.
Along with proving or disproving fatherhood at birth, we could require all males to receive a reversible vasectomy(a mechanical device know as the "ball valve") at the age of 14. Once the boy reaches the age of majority, he will have to pass a series of psychological exams, which will determine if he is mature enough to deal with the burdens and occasional disappointments which are an inevitable part of parenthood.
Once his certificate of manhood is obtained, he has the option of having his ball valves(2 are required) turned on.
This will prevent the creation of children who discover too late in life that fortune and circumstance has put them in the wrong place at the wrong time, and are thus no longer loved by the man who they called Daddy.
If you want to be immortal, write a poem.
It's an easily demonstrable fact that some men reach adulthood, without the prerequisite skills to perform as a father to a child. My vasectomy idea would require a man to demonstrate his proficiency before being allowed the opportunity to become a biological father and risk raising sons who would be too self centered and selfish to be a good father, thus perpetuating the problem.
Such a system would save society a lot of time by eliminating the need for discussions such as this one.