Ok, i spent more time on improving character rig today, so i didn't managed to create a longer loop for a show.
Anyway - check out this short loop here. It's the scene from LWH, and it's quite possible to convert most sex-scenes from there. The only problem is the belly bulge, cause you can't create real-time deformations in the game. But i will see for a different implementation.

Check it out:

VIDEO