How have zoos succeeded in having more pandas held in captivity mate?

Explanation

For many years, zoos have struggled with how to get their pandas to mate. Both males and females showed little interest in sex. Then an employee at Chengdu Giant Panda Breeding and Research Base in Sichuan Province, China, had a good idea: he started showing their pandas 'panda porn'. Now, upon reaching sexual maturity, zoo-keepers show their pandas videos with panda sex to introduce them to mating rituals.