Probably Virt-a-Mate.[/quote]
Eeww!

[/quote]
Hope you didn't have meant this serious. I'm talking about the "ewww"

Virt A Mate is the best VR Sandbox available. You can easily port sfm or blender models to daz and then to virt-a-mate or create your own daz models. This alone is insane but it get's even better. Now you can use this model of your wishes in any location, in any pose and have automatic or manual sex in vr with hand controls. The awesome available plugins will let the model react naturally, moaning, blushing, vaginal movement and alot of other cool thing easily accessable. It even has haptic device support for gloves, suites and several sex toys.
Instead of manually arranging what sexual act you like, you can do your own animations and scenes and safe them for later use with the possibilty to easily change the pose, model, hair, clothes, skin, textures, location etc. Not to mention it is a fully functional posing and animation Editor what works better in desktop mode what means you can use it without vr as well.
There is only one thing that is actually challenging and time consuming with virt-a-mate and that's learning the more advanced functions and cloth physics. Yes virt-a-mate has real clothing physics (what does look really cool, undressing your waifu with your own hands

) beside default jiggle physics.
So you should say "yay" because it still gets regular updates all the time and several mods each day.