18 USC Sec. 2423 is a federal law that criminalizes the transportation of minors – people who have not attained the age of 18 – for the purpose of prostitution, or in any sexual activity for which any person can be charged with a criminal offense.
So, for instance, if the defendant brings the person across state lines, or into the United States, and the person is a minor, the defendant can be fined and imprisoned not less than 10 years or for life under this act.
In addition, 18 Sec. 2423(b) criminalizes any travel across state lines or into the United States for the purpose of engaging in any illegal sexual conduct with another person. Under this section, a person could be imprisoned not more than 30 years.
In addition, 18 Sec. 2423(c) criminalizes any travel to foreign places where the person engages in illegal sexual conduct with another person, and the person can be imprisoned and fined not more than 30 years.