Its funny I was just thinking maybe it had something to do with the fact that the men had super sperm.. That's a good reason.. There is always the "usually reversible Vasectomy*.. LOL

* Vasectomy - Wikipedia, the free encyclopedia

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Please don't give up, Des. Because all we really need to survive is one person who truly loves us. And you have her. I will wait for
you. Always. I love you, Pen

DESMOND: I love you, Penny. I've always loved you. I'm so sorry. I love you!
PENNY: I love you too.
DESMOND: I don't know where I am, but--
PENNY: I'll find you, Des--
DESMOND: --I promise--
PENNY: --no matter what--
DESMOND: --I'll come back to you--
PENNY: --I won't give up--
BOTH: I promise. I love you.

OR why aren't pregnant women sent away from the island (via the submarine) for their last 2 trimesters? They could return with the babies after the birth. That would be waaay easier than a surgical solution.

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"Helen, do you remember that authentic Australian walkabout I told you about?"

I think there is birth control on the island. But to solve the problem of the dying mothers they need to experiment, and to experiment they need test subjects- aka pregnant woman. You can't solve a problem that isn't there.

well they do have a box where they can imagine up submarines so i think any contreceptive wouldn't be too hard to get. plus they have a lot of medical equipment and medicine. i don't see why they wouldn't have it.