fairly that is because... for economic and political reasons... Qatari's i guess is not too far with the rules that has in Saudi...

Any man can marry any nationalities outside their own country but never a woman can marry any non-believer and excepts only of their own nationality.

in Saudi, there had been a case of a distant-relative princess who had marry an outside Saudi national, and had only been allowed as issued by a special law granted only for such case...

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