non-hormonal methods

Why is birth control always the woman's responsibility?

I heard about a male birth control pill a few years ago but have not heard anything about it since. Does it even exist? Other than the condom, I feel like it's always the woman's responsibility. I know that the consequences of unprotected sex are heavier for women but I would love it if it wasn't always the woman who had to throw her body out of whack by taking birth control....