When you try accessing adult content you will be requested for a pin, this pin is there to prevent unauthorised people or underage people to access the content, you can call it a parental pin. This pin is necessary every time you access the content.
Further once you try play the content you will be prompted to authorise your device, you can do that from any device inside your home, for example if you try to playback from your fire tv, you can authorise your device from your mobile phone by going to the following site: http://openload.co/pair and click on pair now. that's all, all your devices will now be able to playback for 4 hours. hereafter a new authorisation is required before playback.