The measure by San Francisco Assemblyman Tom Ammiano, a Democrat, would require sperm donors, surrogate mothers and the people with whom they work to have a child to fill out a series of forms detailing the rights and responsibilities of each person.

“The science behind having families has advanced more quickly than the laws,” Ammiano said. “This bill is just an attempt to catch up with the realities and help these couples enjoy their modern families.”

The bill, which would apply to same-sex and heterosexual couples alike, was passed by the state assembly by a wide margin on Monday. It would require all couples who use sperm donation or surrogacy to conceive a child to state ahead of time who would have parental rights and responsibilities and who would not.