Buy each girl separately and own them forever. No membership required.
Download SinVR for the 'classic' experience, or Forbidden World to 'go a bit deeper...'
for Windows (PC / VR)
Supported VR Headsets: HTC Vive, Oculus Rift, Oculus Quest (Oculus Link mode), Microsoft Mixed Reality
SinVR does *not* currently support Oculus Go, Samsung GearVR or Android/Cardboard