Traditionally, society extends more protection to girls than boys, and for good reasons. One, girls will be tempted with inducements from males long before they have developed the maturity needed to discern the risks involved. When they succumb to these inducements, they either get pregnant out of wedlock or undergo experiences that mess their psychology irreparably. Both these outcomes will impact the rest of their lives negatively, and, sometimes, their future generations as well.
Young women are highly impressionable and naive. For instance, it does not take much effort to get a normal woman to record her nudity to please a man. This is evidenced in the higher incidence of female nude materials compared to that of men. When left to own devices, girls are more likely to be drawn into social distortions that will leave them as the biggest victims.
Young women wield immense sexual power, which, if uncontrolled, will leave many victims in its wake. However, if controlled by mature society members, the young woman is likely to end up with a stable family as a mother first, and a grandmother in future. It is better to guide the expression of this power for a few years than risk burdens for generations to come. Most women today owe their stability and happiness to stringent social structures.