Oooh they definitely have at least a few sex videos...but maybe more of the type where Reigen just whips out his phone mid-fuck when he thinks Mob's especially cute. At that point Mob's so blissed out he can't hide himself properly and his powers have turned to putty, so he's just letting shishou record while maybe trying to whine not to and cover his face or their privates, depending on which Reigen's focusing the phone on.

They try to have an actual camera a few times (Reigen pulls up an excuse, Mob goes "Huh. Okay") but Mob gets so nervous his powers either fry the camera completely or turn it away. Just the sound of skin slapping to skin, the furniture's creaks, and Mob's voice and their whispered *love you*s are hot as hell, so those count as successful ones.

Reigen's tempted to upload some of his phone videos online just to show off but he equal parts doesn't want to land in jail and equal parts wants to keep Mob only to himself. Maybe he'd share those ones where the camera's turned away and amuse himself with people guessing Mob's age from the pitch of his voice.