Who is responsible for birth control?

Who is responsible for birth control if both parties aren't ready for kids? The man or the woman?

Who is responsible for birth control when only the woman is ready for kids? (Or vice versa)

Who is responsible for birth control overall?

I feel that both the man and the woman are responsible for birth control because they are both engaging in sex. If neither of them wants kids, they should both take precaution. When only the woman wants kids I think it is the man's responsibility . He should make sure he always wears a condom to prevent getting the woman pregnant with a kid he doesn't want and to prevent money and custody drama.

What do you ladies think?