What is the ideal age for schools to begin teaching sex education to students?

Thinking about the topics that a sex education course in school may discuss, do you think each of the following topics should be discussed or not discussed in a sex education course? (Intercourse, Non-penetrative sex, Sexual abuse, Abortion, Sexual pleasure, Abstinence, Venereal diseases STD, Pregnancy & birth control, Homosexuality, Bullying)

Looking back to the time when you were a teenager, how useful were each of the following in enabling you to learn more about sex? - by gender (Conversations with friends, Television/books/movies/magazines, Sex education courses at school, Conversations with my parents/guardians/family)

Is it ever acceptable for students and teachers to connect through social media outlets (e.g. Facebook)? [social networking sites] If cyber-bullying occurs between students outside of school time, should the school take action?

% of adults living in a household that includes a child knew of a case of cyber-bullying against at least one of the children in their household, Age of child during the most recent incident, Relationship to the bully

Cyber-bullying by socio-demographic characteristics (e.g. marital status, homosexual, bisexual, heterosexual, young adults (18-24 years), education, income)

Self-reported Internet bank fraud victimization and Problems with Internet purchases by characteristics of Internet use [e.g. use social networking sites, frequency of online purchases)

Internet users who came across hate content on the Internet, by target group of the hate content (Ethnic or religious minorities, Homosexuals, Women, Aboriginal people, Immigrants, Persons with disabilities, Seniors, Other) [hate crimes]