Adult
From Voyeurweb's Wiki about Sex
Someone who reaches maturity is considered an adult. Most people reach this after leaving high school around the age of 18 years old. However, some never quite leave adolescence their entire lives.
Children cannot wait to become adults so that they can do whatever they want to do. Adults wish they were kids and free of responsibilities. Adults may have a childlike attitude, but adults never are childish. Childish attitude reflect aging adolescents.
VW requires all visitors to be adults.