[quote=shivershiver]
But then so would every other arid country. Remember, even the best kept secrets never last. The atomic bomb was kept away from the rest of the world for only a few years before the schematics were stolen by Russians and distributed worldwide. I suggest, in order to keep the plot a little more simple, the y chromosome breaks down within the span of 2-4 years, dropping the male to female birth ratio to 1:10 so we only have to rewrite 20 or so years of human history rather than 40.
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I posted at the same time you did with an explanation to this issue. Saudi Arabia was the first to take advantage of this, and that is all they needed for that all important preemptive strike to take place. By the time schematics could have been stolen they already had their butts whooped.

As for the time scale if it breaking down, I'm open to change. We can put more thought into it to provide the best numbers, but right now I'm too tired to do too much more thinking.