In a desperate bid to build its fan base, Spanish football club Getafe has released a video urging fans to become sperm donors in order to breed more season ticket holders.

The tongue-in-cheek video opens with a fan standing in front of an empty stand under the words: "There's a problem: there aren't many of us." Then the voiceover tells us there is a solution, as the camera pans to the fan's crotch. We next see him in a sperm donor clinic collecting a plastic container. He is handed a DVD entitled Zombies Calientes de Getafe, or Getafe's hot zombies.

The film, shot in the style of a 1970s porn film, shows young women in a room whose walls are covered with Getafe posters, flags and scarves, drinking a potion that turns them into sex-mad zombies. The idea is that the DVD is so erotic that the sperm donor has no difficulty in making his contribution.

In the next shot, a woman is holding a baby, one of a new generation of Getafe fans. The film ends with a graphic representation of a sperm entering an egg and the words: "The more the better." In the final frame the viewer is informed that the DVD is available at their local sperm donor clinic.

The club's marketing director José Antonio Cuétara said the film is "controversial but very good," adding that the club has around 9,000 season ticket holders but needs more. Ángel Torres, who made the film, said the campaign isn't directed towards any particular sector of the public, but "just those with a sense of humour".

Getafe play in Spain's top division, La Liga, meaning they have to compete for attention with glamorous local rivals, Real Madrid and Atlético Madrid, who have 85,000 and 42,000 season ticket holders respectively.

Torres, however, is optimistic. "If the campaign is successful, we'll have to build a bigger stadium," he said.