According to retired Lt. Gen. Michael Flynn, a former head of the Defense Intelligence Agency and a potential vice-president pick for Donald Trump, the hard drives of ISIS fighters are largely filled with porn.

Lt Gen. Michael Flynn addresses an audience during a change of directorship ceremony at the Defense Intelligence Agency. (Photo: US Department of Defense Erin A. Kirk-Cuomo)

"We looked a ruthless enemy in the eye - women and children, girls and boys, raped and exploited, the beheadings stored on a laptop next to pornography," he said in his new book. "At one point we actually had determined that the material on the laptops was up to 80 percent pornography."

This isn't the first time a western leader has leveled charges of a pornography epidemic at ISIS forces. Former London mayor British Foreign Secretary Boris Johnson accused them of favoring adult material as well.

"If you look at all the psychological profiling about bombers, they typically will look at porn," he said in 2015. "They are literally wankers. Severe onanists."

These guys all have porn-filled hard drives*. (*Probably) (Photo Credit: YouTube/Vice News)

ISIS may be facing a porn shortage soon, though. As the "caliphate" is reclaimed by the coalition, ISIS strongmen have begun destroying internet cafes and cutting off web access.

Ret. Lt. Gen. Michael Flynn's new book, "The Field of Fight: how We Can Win the Global War Against Radical Islam and Its Allies," is available now.