California's highest court on Monday barred doctors from invoking their religious beliefs as a reason to deny treatment to gays and lesbians, ruling that state law prohibiting sexual orientation discrimination extends to the medical profession.

Justice Joyce Kennard wrote that two Christian fertility doctors who refused to artificially inseminate a lesbian have neither a free speech right nor a religious exemption from the state's law, which "imposes on business establishments certain antidiscrimination obligations."

In the lawsuit that led to the ruling, Guadalupe Benitez, 36, of Oceanside said that the doctors treated her with fertility drugs and instructed her how to inseminate herself at home but told her their beliefs prevented them from inseminating her. One of the doctors referred her to another fertility specialist without moral objections, and Benitez has since given birth to three children.

Nevertheless, Benitez in 2001 sued the Vista-based North Coast Women's Care Medical Group. She and her lawyers successfully argued that a state law prohibiting businesses from discriminating based on sexual orientation applies to doctors.

The law was originally designed to prevent hotels, restaurants and other public services from refusing to serve patrons because of their race. The Legislature has since expanded it to cover characteristics such as age and sexual orientation.