Sex education has evolved from early moralistic lectures against sex and masturbation to different modern approaches in schools. Originally taught by physicians, sex education is now debated as either "abstinence-only" or "comprehensive." While abstinence advocates argue teaching contraception undermines abstinence, comprehensive supporters counter this leaves students unprepared and at risk. Comprehensive education is seen as a human right protecting youth, though some believe it violates religious freedom. Attitudes shift as modern societies see people marrying later and relationships changing, yet current sex education delivery is often brief and not taken seriously due to immature classroom environments.