Sex date percentage?
No. It's suppose to be a secret people find out after reading the SCM database. Anyone already captured Real Tall Lady could have reset her quest to try again.
As of now they can be used to reset questlines.
I think Masuo says that I shouldn't mess with those mannequin as it has trapped Lust. She can't be freed by him since she was captured by him and Ryoko in the first place.
In next few updates there will be total 4 ghosts with secret animations.