It is odd that those like Juliette would not end up pregnant. Ben feared his daughter would become pregnant and so captured her boyfriend to keep this from happening. If it really is that easy to get pregnant on the island, you would assume someone like Juliette, who is essentially single and aware of the dangers of pregnancy, would do everything she could to keep from getting pregnant. Had she been pregnant with Goodwin's baby, there definitely would have been a Scarlet Letter thing going on (not to mention the imminent death). I wonder if they'll ever address this. Jin couldn't have a baby before and got his wife knocked up in a matter of weeks. All those Others who've lived there for years are able to "chose" whether or not to get pregnant. They must have some form of really great protection.