Well let me ask you:
- Can you right now watch porn movies on BD/DVD via your PS4?
- Can you right now watch porn movies on the web via the PS4 browser?
- Can you right now watch porn movies on usb/copied to hdd via your PS4?
As far as I know the answer to these questions is yes. Thus:
- VR porn streams on websites will be possible on PS VR
- VR BD/DVD playback will be possible via PS4 mediaplayer (once it has the VR movie update)
- VR file playback will be possible via PS4 mediaplayer.
What in all likelyhood won´t be possible:
- Selling porn via PSN or dedicated porn apps
- Porn GAMES. Wether retail or digital.