The solution to the world population problem is at hand! We all want "wanted" children--babies who are planned for and have the financial base for health and happiness. All that is needed is a few reasonable restrictions on men.
If we could control men's fertility, unwanted pregnancies would be a thing of the past. It's obvious that men can cause hundreds, even, as in the case of sports figures, thousands of pregnancies. Men can manufacture sperm from adolescence till their death and with their tendency to dominate sexually, the problem of unwanted children is created. Women, on the other hand, though it is possible for them to have from 30 to 35 pregnancies throughout their lives, usually, depending upon their intelligence, stop producing after four to twenty children. From these facts, it's obvious where our concerns and efforts should be focused.
The implants would be removed only for procreation under the proper circumstances. i.e., the man has permission from a designated female and has the financial resources and psychological attributes to be a good father.
Since men could continue to have sex and father children, these measures would not infringe on their rights to control their own bodies and life styles. With just a few of these simple and reasonable restrictions the over-population problems of the world could be solved. If men can't control their reproduction capacities, the states and the nations will have to assume control for them!
If you think that the above scenario seems a bit outrageous and ridiculous know that men have tried to control women's sexual functions since time began. The day men let a committee of women regulate some of their sexual functions is the day I will no longer need to be a feminist.