A 75-year-old Russian grandfather has become a porn star after wandering into a blue movie audition by mistake.

David Bozdoganov unknowingly wandered into the Gorodcki production company's studios after mistaking posters for erotic actors as an advert for a strong man show.

Director Alexander Plahov says: "We were auditioning for a new film and had a number of couples on stage simulating sex when I saw an old guy standing at the back.

"I wandered over to ask him to leave when I saw this massive package straining against his trousers. I thought, now this could be an original idea.

"And I was right - all the movies we've made with David have been huge successes."

The company's biggest hits have been "The Old Neighbor" and "The Handyman at Work".