Eli5 why are there so many female birth control options for females but only condoms and vasectomies for men?

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Was in a discussion about this over dinner last night. My GF has like a dozen options: from pills, to implants and patches. I can either wear a condom or have surgery. I feel like there is always some male pill on the horizon that never manages to come. Why is it so hard to develop something for men but so easy for women?

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