And there's a reason that the Human Rights Watch's report on male rape in prisons is called "No Escape."
http://www.hrw.org/reports/2001/prison/
"Prisoners unable to escape a situation of sexual abuse may find themselves becoming another inmate's "property." The word is commonly used in prison to refer to sexually subordinate inmates, and it is no exaggeration. Victims of prison rape, in the most extreme cases, are literally the slaves of the perpetrators. Forced to satisfy another man's sexual appetites whenever he demands, they may also be responsible for washing his clothes, massaging his back, cooking his food, cleaning his cell, and myriad other chores. They are frequently "rented out" for sex, sold, or even auctioned off to other inmates, replicating the financial aspects of traditional slavery. Their most basic choices, like how to dress and whom to talk to, may be controlled by the person who "owns" them. Their name may be replaced by a female one. Like all forms of slavery, these situations are among the most degrading and dehumanizing experiences a person can undergo."
"The first time M.R. was raped -- "which felt like having a tree limb shoved up into me" -- he told the prison chaplain about it, and the chaplain had him write out a statement for the facility's Internal Affairs department. According to M.R.'s description of the events, the Internal Affairs investigator brought both the victim and the perpetrator into a room together and asked them what had happened. Although M.R. was terrified to speak of the incident in front of the other inmate, he told his story, while the perpetrator claimed the sex was consensual. After both of them had spoken, the investigator told them that "lovers' quarrels" were not of interest to Internal Affairs, sending them both back to their cells. "The guy shoved me into his house and raped me again," M.R. later told Human Rights Watch. "It was a lot more violent this time."
M.R. spent several months trying to escape the rapist, facing repeated abuse. He filed grievances over the first couple of rapes in an effort to draw the attention of prison officials; they were returned saying the sexual assaults never occurred. On the last day of December, the rapist showed up on M.R.'s wing and threatened to kill M.R. with a combination lock. "I was in the dayroom. I remember eating a piece of cornbread and the next thing I knew I woke up in the hospital," M.R. recalled. A room full of prisoners saw the rapist nearly kill M.R. and then rape him in the middle of the dayroom. The rapist hit M.R. so hard with the lock that when M.R. regained consciousness he could read the word "Master"--the lockmaker--on his forehead. Four years later, a Human Rights Watch researcher could still see the round impression of the lock on the right side of his forehead. In all, M.R. suffered a broken neck, jaw, left collarbone, and finger; a dislocated left shoulder; two major concussions, and lacerations to his scalp that caused bleeding on the brain. Notwithstanding the extreme violence of the attack, and despite M.R.'s best efforts to press charges, the rapist was never criminally prosecuted."
There's also stuff about prison staff deliberately placing at-risk prisoners ("young, small in size, physically weak, white, gay, first offender, possessing "feminine" characteristics such as long hair or a high voice; being unassertive, unaggressive, shy, intellectual, not street-smart, or "passive"; or having been convicted of a sexual offense against a minor") with prisoners known to have raped other prisoners in the past.
There are lots of people who assume that prison rape is either an unavoidable or - more disgustingly - a desirable part of prisons, unfortunately.
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"Luxe, calme et volupte." - Charles Baudelaire, The Invitation to the Voyage