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The only time they could have a problem is if something goes wrong - someone falls ill or is in an accident for e.g. In reality, very unlikely, but if they don't have a specific reason for visiting (i.e. visiting a relative) why not go for a non-ME country for a holiday?
I do wonder sometimes - with all the beautiful places in the world to spend a vacation, why some people choose to come to the ME even with the (albeit unlikely) risks associated if they're not married.