I actually thought I heard someone say in DC the age was 16?
It is, but a Federal law (sponsored as a bill in the House by Foley) makes it a Federal crime to use the internet to solicit sex from a minor, irrespective of local age of consent laws.
(Which leads to the question of whether an e-mail from a husband to his 16 year old wife duely married under the laws of DC or Kansas signed "NORWICH" is a violation of Federal law, but I digress.)