Watch and download Hell Behind the Bars (1984) on taboovideos.
For more mainstream forced sex scenes check out the rape in cinema category.

A woman murders her boyfriends and steals some diamonds he has smuggled. She gets found out though, and locked in a prison with an evil, sadistic bisexual warden. She immediately sets about planning her escape with some of her fellow inmates, but the plans are even more difficult than they seemed when set in motion.

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