Apparently by local custom they were both two years old.

And then he just left, so I'm not sure what "marriage" even means in this context. Under our laws it would be something more like "statutory rape" but I do wonder what actually applies here.

This isn't something I've looked into, just something I saw on 20/20 or some similar show once, so you might be right that it only applies to those setting up tours or going on them rather than to conduct that happens overseas.