[CobaltBlue]

Read the opinion and you'll that where you're wrong.
http://a257.g.akamaitech.net/7/257/2422/26jun20031200/www.supremecourtus.gov/opinions/02pdf/02-102.pdf

Some states do have a lowish age of consent. In the 19th century sex with 12 year olds was allowed, but that's considered backward these days. The typical age of consent in the US today is 16.
http://www.ageofconsent.com/ageofconsent.htm

[aristeides]

If children were capable of giving consent to sex at age 12 in the 19th century, what about them changed to make them incapable of giving consent today?