A Thai zoo, which has hosted a couple of pandas for four years, will play "porn" videos for the male next month to encourage them to breed in captivity, the project manager said on Saturday.

The pair -- living chastely together at the zoo in the northern city of Chiang Mai since arriving from China in 2003 -- would be separated in December, but stay close enough for occasional glimpses of each other, said panda project chief Prasertsak Buntrakoonpoontawee.

"They don't know how to mate so we need to show the male how, through videos," Prasertsak told Reuters.