I believe I've seen similar movement....

in Juon (The Grudge). Perhaps you can ask Kayako if she provides.

It all depends on the time of day. If I came across working girls who moved like that after midnight, I'd call the local Catholic priest and ask him to perform an exorcism ASAP. There's something utterly unnatural about how those girls were moving their bodies.

Only in my dreams could I bend like that! I can still get my legs behind my head though

Go to Brazil or Colombia.  I highly recommend both places.