Two San Francisco police officers have been caught moonlighting in a hardcore porn movie.

The male and female officers starred in a 45-minute film called Bus Stop Whores.

They performed a number of explicit sex acts in the movie, reports the San Francisco Chronicle.

The man has been taken off the beat and has been given a desk job but his co-star, who works for the Sheriff's Department, remains in her post at San Francisco General Hospital.

But she could be in trouble with her bosses who suspect she has made more films, attended adult film conventions and, until recently, had her own adult website under the name Reina Leone.

Bus Stop Whores was apparently filmed in Los Angeles and is being sold on the internet.

SFPD Officer Maria Oropeza said: "The department has immediately initiated an investigation to determine if there is any violation of department rules and procedures or if any criminal misconduct has occurred."

But some in the department were a little more relaxed: "Hey, this is San Francisco - what do you expect?'' said Sgt Joe Garrity.

"Personally, I haven't seen the movie - but then I'm more of a Disney kind of guy. But from what I hear, Brad Pitt doesn't have anything to worry about.''

The pair could keep their jobs. In January, an appeal court ruled that a San Diego cop sacked for selling explicit films of himself should be given his job back.