Since it allegedly occurred in another country, The US cannot bring charges of rape. But they can bring charges of possession of child porn.
Wanna bet on that?
Hundreds of people have been charged here for child sex they carried out in Thailand. Look it up.
extraterritorial sexual exploitation of minor children
There are US laws that if one goes to a foreign nation with the intention of engaging in sex with a child, that person can be charged as if it occurred in the US.
If I am correct on this, a U.S. citizen cannot travel to another country to have sex with children, and he can be prosecuted for it under U.S. federal law.
Yes the federal government can charge you if you have sex with children over seas . It became a law when pedos were going to southeast Asian countries to get their jollies. It might have become law under Bush.