Something so extreme and egregious must involve demon possession.
Coild be, but it coild also just be people totally,given over to their depraved fantasies that they no longer fight the despicable urges. There comes a point where God stops trying to call,a person who,has committed themselves to depravity, and at thay point, the holy,spirit is no longer a constraining voice in their lives because the person has shut their conscience down to his wooing.