Because they just haven’t been able to develop one that is effective and that has tolerable side effects yet. There have been some hormonal ones developed that showed to be much less effective than the pill while also having significant side effects, including a significant risk of permanent infertility. Human trials are starting on one that might be effective and relatively side effect free, which stops a certain protein necessary for the process of making sperm. But as of now there simply is no product on the market similar to the pill for men.
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