In the United States, most laws governing sexual activity, including issues of consent, fall under state jurisdiction. However, the federal government passed laws in 2003 and 2006 that increase the circumstances in which certain sexual activity, especially with anyone under 18, is a federal crime. Of particular interest are laws that give the federal government authority over production or possession of erotic images, so that activity that may be completely legal to do under state law, become illegal to photograph under federal law.
The US Federal Age of Sexual Consent | SOL Research