I just listened to a radio caller. If they injected a substance into a human they developed an allergy just like the peanut allergies. One of the reasons that the shot has to be kept so cold is because sperm die really quickly. If they keep sperm alive long enough and inject them into our bodies then when boys start puberty their bodies will attack their organs. When sperm enters a woman naturally her body will do the same. This is not the only method of attack but a new one I just learned about. It makes sense. Prove it wrong.