The most current and technologically advanced virtual sex games are usually not free.
The gameplay isn't obstacle oriented, it's completion based similar to receiving an achievement for clearing a whole map in your favorite MMORPG.
In 3D Sex Villa 2 it's virtual sex toy collectables.
Collectables are a big thing in Thri XXX's virtual sex world.
From the your starting avatar to your virtual "home" that is created complete with a vast array of sex toys and tech for you and your visitors.
Who has the biggest, lustiest virtual sex room online?