birth control functions by flooding the woman with a hormone that signals to her body that an egg is already attached to the uterus. if they some how get pregnant this mismatch of hormones can cause birth defects. and that's with one egg.

now imagine the possibilities when you have millions of chances to fuck up. what happens when the protein only partially binds and you have a retarded sperm find an egg? what happens if it doesn't bind at all and is carried into egg and made part of meiosis?

https://archive.fo/bKXIR :

Scientists closer to a male 'pill' without side effects | Daily Mail Online

'Thirty hours after infusing male macaques with a compound known as EP055, their sperm were unable to move, a study found. '

'How the research was carried outThe scientists infused four male macaques with a 75-80mg/kg dose of EP055. '

'Scientists have edged one step closer to creating a male pill, new research suggests. ', "Within six hours of infusion, the monkeys' sperm mobility was reduced by around 20 percent.", "In addition, all of the monkeys' sperm were moving as normal within three weeks, suggesting the treatment is reversible, the research adds."

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