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To force population growth, concentrate on one woman at a time. Note the population number, then just keep picking her up and dropping her on a man. The number will either stay the same (unsuccessfull breed) or go up one (indicating that she's now pregnant). They don't have to ever get near the hut. The kissy sound is the key. If your number didnt go up, pick her up and drop her on him again (or pick another guy). Eventually, the number will go up.
I took your suggestions. I first picked Kiki, a Adept Scientist and first tried several times with Kumi, a Adept builder. No go. Then I tried Kiki with Hoto, a Master Scientist. No go, either. I dropped Kiki and picked up my Master Scientist, Raha, and dumped Hoto on her til the number went up. My little island colony now numbers eight! 
My islanders are rather stubborn, aren't they? 
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Rainbowfish
~LDW Games addict.