Sex education in the United States is taught in two main forms: comprehensive sex education and abstinence-only. Comprehensive sex education is also called abstinence-based, abstinence-plus, abstinence-plus-risk-reduction, and sexual risk reduction sex education. This approach covers abstinence as a choice option, but also informs adolescents about human sexuality, age of consent and the availability of contraception and techniques to avoid contraction of sexually transmitted infections.