How would you discipline a teenage child?

Being the mother of a teenager, I believe one has to be more of friends with the teenager than simple rebuke him. Teenagers cannot be treated the same way as the toddlers. Their body and mind goes through changes. Parents need to talk about good and bad, peer pressure, sex, body changes, etc. everything, at the same time somewhere they should know that the parents are still the authority. Teenagers also need to follow a routine, follow the basic values of love and respect, be answerable to the parents. Disciplining teenagers is by a mix of being "parent" and being a "friend".