Sex education in school

If school don’t offer sex education, where can childeren be taught about it? Whatever people’s relifion, I think everyone should get sex education. Muslims might diagree, but they need it. Sex education should be an obligation, because ignorance about sex can create sexual crime. Let’s think about Korea. Koreans avoid to talk bout sex in conversation. Only wat for children to get sex information is approaching media.
But the problem is media can create an incorrect picutre of sex. And nowadays peiople have access to a wide range of birth control methods, but many people don’t know how to use them. They need education in school. Even though, other private institutions offer sex education, children are too busy to get that.