For almost a decade in the sleepy southern French village of Mazan, Dominique Pelicot kept a shameful secret about what he did at night.

In the light of day, the 72-year-old who enjoyed cycling and painting was a regular family-man: a devoted husband and father of three who his wife, Gisèle, called a 'super guy'.

But in private, the retired electrician led a double life fuelled by countless hours spent on an anonymous online chatroom - Coco - where he solicited dozens of strangers to come to his house and rape his unconscious wife who he had drugged asleep.

Coco and its rape-fantasy forum - called 'without her knowledge' - was shut down by authorities last year and its founder, software engineer Isaac Steidl, was arrested in January. But multiple other online communities exist where users are free to express their most twisted sexual desires.

In fact, the depraved platform has already been replaced with a copy-cat site: Bounty.chat. The website claims to cater to a range of fetishes - including BDSM, cross-dressing, and in a grim-echo of the Pelicot case, candaulism: when a man exposes his female partner, or images of her, to others for their voyeuristic pleasure.