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A friend of mine is doing her PhD thesis on sperm hats. I'm not really up to speed on biology, but as far as i can tell, when sperm are produced they wear some kind of chemical hat that prevents them from being capable of fertilising. Somewhere along the way they lose their hats [kind of like in an american graduation ceremony] and become the real McCoy. She's researching when & where & how & why this hat-dumping occurs.
Anyhow, if it's viable, there might be away to make sure that the sperm get to keep their hats on, meaning no fertilisation... It could be through regular inoculation, a single dose of something at birth/adolescence... i think the technicalities of finding a way of sterilisation is easier than finding a 100% secure application. It'd work better if both men & women were sterile, cutting down the odds of one randy bugger slipping through the net and screwing things up. |
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