From the enactment of legislation in 1971 to replace gendered pronouns with gender-neutral pronouns, until 1977, California Civil Code § 4100 defined marriage as "a personal relation arising out of a civil contract, to which the consent of the parties capable of making that contract is necessary." This definition was uniformly interpreted as including only opposite-sex partners, but, because of worries that the language was unclear, "Assembly Bill No. 607", authored by Assemblyman Bruce Nestande, was proposed and later passed to "prohibit persons of the same sex from entering lawful marriage."