When is an individual not responsible for their own behavior? What about groups? Committees? Executive boards?
A person who gets behind the wheel of a car after consuming ethanol is responsible for that decision. If we catch them, or they hurt someone, we put them in a cage(Sometimes, sometimes not). Because they are 'responsible' for their behavior.
Another pair of people consume ethanol and engage in sexual activity. Later we put one of them in a cage, because one of them is 'responsible' and one is not.
An adult is sometimes 'responsible' for the well-being and safety of certain children, but for some reason not 'responsible' for others. This one I can make rational arguments for, but they have a lot of basis in genetic competition in general, and eugenics in specific.
Also, I would prefer to address this question without bringing gender into it, because I hold every competent adult human to the same standards of behavior and maturity.
Regarding this ^^^ bit, I think it's necessary to write laws with that assumption.
This may interest you, The Impossibility of Moral Responsibility
Nobody's actions are without influence of others, so how can anything truly be one sole person's fault, and furthermore, the idea that we actually could choose differently at any given moment of our past given the past before that moment stayed the same seems impossible.