I don't own any VR gear and haven't explored, but isn't this one of those tech 'adoption' areas that is driven by porn, like VCR's were? FB & porn don't seem like good bedfellows, as it were...
The problem is you can't just simply film a scene (be it porn, regular film, or some sports thing) with a couple of cameras and send it to someone to experience on a headset. People need to move their heads around, and fixed camera positions don't allow for that. When someone moves their head and their view doesn't move they start to feel sick.
There's possible ways around this. Light field tech, or CGI actors etc, but neither of those are quite there yet. As such, porn as it exists in VR today is effectively just putting a really really big screen in front of you in VR. It's not actually VR.