The conservative Roman Catholic archbishop of San Francisco has developed a new document for Catholic high school faculty and staff clarifying that sex outside of marriage, homosexual relations, the viewing of pornography and masturbation are “gravely evil.”

Archbishop Salvatore Cordileone’s document applies to faculty and staff at four Catholic high schools: Riordan and Sacred Heart in San Francisco, Marin Catholic in Kentfield and Serra High School in San Mateo. It states that administrators, faculty and staff “affirm and believe” the controversial statements, which will be part of the faculty handbook.

The document goes on to say that marriage is between “one man and one woman,” despite California law allowing same-sex marriages. It also notes that sperm donation, the use of a surrogate and other forms of “artificial reproductive technology” are also gravely evil.

The document notes that while not all staff at the schools are Catholic, they are “required to stand as effective and visible professional participants and proponents of truly Catholic education.” Those who are not Catholic “must refrain” from participating in organizations that “advocate issues or causes contrary to the teachings of the church.”

In a letter to teachers at the four high schools, Cordileone wrote that his document isn’t intended to single out for dismissal any teachers but that the schools must buck the “tremendous pressure the contemporary culture places on everyone to conform to a certain agenda.”

“This pressure is exerted relentlessly in the media, in entertainment, in politics, in academia, in corporations — in short, in all the influences of popular culture,” he wrote.

Cordileone said Catholics endorsing contrary views “creates a toxic confusion about our fundamental values.” The letter calls on teachers “to avoid contradicting church teaching on these issues either in the school or in some public way outside the classroom.” It is unclear what would happen if a teacher disobeys.

Chris Lyford, a spokesman for the diocese, said the document isn’t really anything new — just a clarification of longtime Catholic tenets.

“This is just a clarification of what’s been there for years,” he said.

Cordileone is no stranger to controversy, especially in one of the most liberal, gay-friendly cities in the world. Last summer, he led several thousand protesters in prayer against same-sex marriage outside the U.S. Supreme Court.

House Minority Leader Nancy Pelosi and Mayor Ed Lee called on him not to participate.

On Monday, it was disclosed that educators at East Bay Catholic schools would be required to “demonstrate a public life consistent with the teachings of the Catholic Church” as part of a new contract.

Heather Knight is a San Francisco Chronicle staff writer. E-mail: hknight@sfchronicle.com Twitter: @hknightsf