do that in a state like California, and you are considered married, regardless of a piece of paper being signed or not.
So yes, he/she consented to common law marriage.
This is from a lawyer. Are you a lawyer by chance?
I am not, and my legal source on this matter is Wikipedia, so, well, there you go.
However, I do note that there is a difference between a lawyer making an argument, and the content of that argument being established law. If the case is decided in the woman's favour (and if it is in a California jurisdiction!), then obviously I am wrong; but, until then, I don't think that it is so clear that I am.