No, I don't find any VR projects that are still under development, these are very difficult and always fail in the middle of the road, maybe because of lack of interest or more expensive costs, so many of these projects stop in the middle of the road.
Basically there was one project that still active developing Adult Things and that was Exolover, Even though it's really slow but they are still actively updating the community, It was taboo but an big market and basically the cost was expensive as you said.
purposes and still lack of interest
Also i think it's just need some time, You can see some Webcam girl or some nude artist already selling their content with crypto especially on reddit, Beside that last NFT Hype bringing some new concept to the market especially adult & crypto combination. It's just about time before we can see Blockchain impact on this market.