Eli5: how vasectomy permanently sterilize you ?

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I understand that immediate sterilization come from the fact that the deferens ducts are cut severed. But, as I have read, the chance of reverting a vasectomy falls quickly after each year after the procedure, to below 10% after around 2 decades or so. I think it not only a matter of rebuilding the ducts, or am I wrong? And if it’ not, what cause the permanent sterilization? (and yes, I am holding a bag of frozen peas in between my legs….).

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What happens to the sperm your body keeps making? It gets broken down and absorbed. As that happens, your body has a chance of creating antibodies against the sperm. Over time, this is more likely. Eventually, it’s pretty much a certainty. So, eventually, you become infertile even if you try reversing the vasectomy because your body attacks the sperm you make.