Under the PROTECT Act of April 2003, it is a crime, prosecutable in the United States, for a U.S. citizen or permanent resident alien, to engage in illicit sexual conduct in a foreign country with a person under the age of 18, whether or not the U.S. citizen or lawful permanent resident alien intended to engage in such illicit sexual conduct prior to going abroad. For purposes of the PROTECT Act, illicit sexual conduct includes any commercial sex act in a foreign country with a person under the age of 18. The law defines a commercial sex act as any sex act, on account of which anything of value is given to or received by a person under the age of 18.
Under the Protection of Children from Sexual Predators Act of 1998, it is a crime to use the mail or any facility of interstate or foreign commerce, including the Internet, to transmit information about a minor under the age of 16 for criminal sexual purposes that include, among other things, the production of child pornography. This same law makes it a crime to use any facility of interstate or foreign commerce, including the Internet, to transport obscene materials to minors under the age of 16.