By the by, when your son does eventually develop an all-consuming interest in coitus, wouldn't you rather that his first taste be with an experienced matron, instead of trying to ravish a 14-year-old girl?
Two inexperienced 14-year-olds experimenting with their bodies are likely to find the encounter to be quite awkward, and there would be a heightened risk of the girl becoming pregnant (in addition to possibly rupturing her hymen).
As for the legal issues: as neither party's informed consent would be legally recognized, neither would be subject to punishment by the government. It could be touchy for the parents. A parent might want to know, but if the parent does nothing to stop or prevent the coitus, then the parent becomes legally responsible, and may face official punishment.
As for the "power-differential" issue: perhaps the boy is stronger and more powerful than the girl? Perhaps their powers are nearly equivalent? I don't know why anyone attaches any relevance to this.
Anyway, once the boy has been coached and taught by an experienced MILF (as was previously done in the Marquesas Islands), the boy would be much better qualified to deflower and ravish any number of 14-year-old girls.