I said before I'm a fan of VAM (Virt-a-mate), though it admittedly takes a powerful PC has a VERY steep learning curve to use. But nevertheless it can be a lot of fun and pretty damn impressive.
Not aware of many (or any) VR games that will operate on macOS personally, though I would be pretty surprised if we didn't start seeing more adult VR content on the next generation of standalone headsets, just from the steadily increasing user base to support more content.