Who knows? ...maybe “underage girls” in other countries is below 12. If so, then the SS men were legal.
Nope. The Protect Act of 2003...
Authorizes fines and/or imprisonment for up to 30 years for U.S. citizens or residents who engage in illicit sexual conduct abroad, with or without the intent of engaging in such sexual misconduct.
For the purposes of this law, illicit sexual conduct includes commercial sex with anyone under 18,