I agree with pretty much all of the responses here... If a child were conceived between two CF people, the child would have CF - though I don't know which mutations would end up with the child... That being said - my understanding is that fertility can be difficult for both the female and male - I believe I've heard about CF women going through extensive care to conceive - I believe that the mucus ain't the friendliest place for conception, implantation and whatnot. But, we've all known a number of CF women who have successfully given birth...
A strong majority of CF men are sterile - I've heard upwards of 90% - due to a disconnect in the vas deferens... I've also heard of CF males who have had sperm harvested and have successfully had children (though those I've heard of have always had a non-CF spouse/mate...) We're not failing in the production of sperm - rather in the delivery...
lakegirl brought up that they won't let us near one another in the hospital, so how can two get together??? As someone else pointed out - often siblings have CF, but also - not allowing us near one another is a relatively new thing, with the "popularity" of cepacia and MRSA and other bugs... I hate sounding old (but it's good that I am...) we all hung out in one another's rooms in the hospital - we hung out at CF camps - we were very physically social creatures (before the internet, for those who don't know that "before the internets" existed!) The internet has been a wonderful boon to allow us to communicate with one another, and be close to one another, without physical contact and swapping bugs... I think in those days, a fair number of us developed closer relationships - but we also didn't live as long...
As for what welshwitch mentioned - I think it will take less than 100 years before CF is a completely different disease - the new drugs out and in the pipeline will likely have a drastic impact on that in the near future... Since I was diagnosed, I've been told a cure or viable treatment was "just around the corner" - that was almost 40 years ago - it really got loud when they found the genetics - that was in the 80s - I've kinda gotten numb to "it's just around the corner"... This is the first time that I'm kinda excited (for others) about the "just around the corner" idea...
Love, steve