Gômon kifujin aka Rusted Body (Kazuo 'Gaira' Komizu, 1987)

This one is bizarre and nasty even by high Japanese standards of weirdness. 

Plot is the simplest one possible: gang of criminals kidnaps wealthy manager and tortures him in order to get the code of his bank account. They are led by this hot and busty lady and other members are her young lesbian lover (I think) with her granddad (ex soldier) and another dude. 

It’s all about sex and torture, so let me go through it quickly:

First one is quite standard fingernails and teeth pulling. It’s quickly over and I think it just serves to show how weird and hot our two female protagonists are. Because they perform this torture topless and prior to that we can enjoy watching them having sex.

Second one is again pretty standard but more old school. They put this naked chick into a barrel filled with eels so “they can penetrate every single hole”. Things start to get a bit strange here because this old guy (fully dressed in his uniform) starts pouring sake into the water. But we soon get the explanation: “You see, the eel are drunk from the sake. They are very lively. You'd better keep your anus tight, as tight as you can.”

Next one is the most bizarre and I’m not sure I’ve got it. Old bastard has invented some kind of bed that transmits sexual energy, so they have this poor guy tied to the chair and he must watch his wife being fucked while that energy is also transmitted into his brain. On top of that there’s our gang leader riding and interrogating him at the same time. All these effort and techniques seem to be successful because guy almost gives in and he reveals first four digits of the account before he comes back to his senses.

Last one is hilarious. Our horny lady gives a guy a blow job but then ties a knot around his dick when he’s erected so he cannot ejaculate. Then they both start fucking him so more he comes in more pain he is. And in the meantime Spanish inquisition continues:

• Confess.
• Never.
• Here he comes again. Terrific. I am learning a lot.
• Help.
• Confess, or it will decay.
• It hurts.
• You see how tight it is?
• It feels good.
• Which is more important? Your money or your dick?
• Money.
• Okay, keep your money. But you will live like a eunuch.
• Farewell to your weapon.
• Okay, okay... I lost. I will tell you. Stop, stop.
• Here comes the third time. Your scrotum will explode.
• 48216709. Ah... I'm dying.
• Ah, me too.

 Cool stuff – short and sleazy and (kind of) sexy and pretty nasty.

6/10