2: No were to turn: Proper education. As Sex is always an uneasy topic, the parents leave it to school, completing forgetting that school is also made up of - you guess it - Adults who have difficulty treating the issue. The result? Conveying the impression that Sex and anything related is a taboo that shouldn't be discussed beyond the curriculum - curiosity points them into the wrong direction. Afterall, Nobody told them that Sex is part of a way bigger to that the fact that our High School/Universities besides redundant education are nothing more than a popularity contest (Hierarchy out of nothing but looks, and anything rebellious, which includes sex appeal), and Pressure groups, need i say more?
Regarding the "removal of freedoms", that's tricky, because if you decide to boost some group of people, you are almost always reducing the freedoms of another group. If this is not the case, then there's no choice to be made, just engineering for clearly better outcomes (and everyone who disagrees with that is just plain evil). Also, being "net positive" in outcome is not enough as a decision criterion: If I were to kill you, harvest your organs, and save the lives of 5 people who would have died otherwise, then the outcome would net positive (4 people alive > 1 person alive), but it would arguably be unjust.