Oh, and before I forget; imagine Western armies not outlawing relationships (marriage) with indigenous people. Unthinkable...soldiers actually creating reliable bonds in the region...unsuitable for a modern army in a foreign country...at the same time an ace for the TB!
(I bet that many macho soldiers would love the role behaviour of Afghan wives...kinda Russian mail order brides.)
Hmmm ... in what world do you think American soldiers and Marines would be interested in marrying Afghan women?

As for allowing sexual relations, I think this would be an excellent idea if we wanted to be thrown out of Afghanistan in the quickest and most embarassing way possible.