This is beyond the scope of the original context but the fundamental question here would be at what point can people provide consent? Currently this depends on a legal per country basis. What constitutes "a minor" is not the same everywhere.

The psychological argument would be whether or not a person is mature enough to fully understand their actions and potential consequences and this is not the same for everyone. People develop maturity - or aspects of maturity at their own pace and at some point will demand or experiment with autonomy and freedom to make their own choices. To deny that reality and instead use oppression/lack of sex education is counterproductive and leads to more dangerous scenarios.