In a law-enforcement first, a 57-year-old man was arrested Monday on suspicion of damaging the reputation of a female athlete by posting a video he secretly took of her in a sexualized context on a porn site, police said.

It is the first time Japanese police have applied the charge of defamation to the sharing online of sexualized photos and videos taken of athletes nonconsensually — a phenomenon that has become a growing social problem.

Hiroshi Ishigami from Ichikawa in Chiba Prefecture is accused of taking an eight-minute video of a volleyball player using an infrared camera to highlight her underwear under her clothes and charging people to view it on a porn site between November 2018 and March this year, according to the Chiba Prefectural Police.