From what I have heard from friends of mine who have done time-- those who are victimized are usually singled out by members of their own race.
Also, from what I understand if your someone who is physically intimidating ( meaning big, muscular, etc.) and you are tested-- and you step up and fight chances are those victimizing you will either back off and let you be, or escalate the situation and try to kill you. Even if your not physically intimidating, most inmates aren't going to continously fuck with you if you stand up for yourself unless its some gang rivalry shit or they have a personal vendetta against you that stems from something that happened outside of jail. When I say victmized I mean robbed, beaten, extorted, etc.--- Homo's trying to rape you would only typically occur at a max secuity place where you have animals condemened on life sentences or for decades. Their attitude is fuck it, im here forever or pretty much forever so im going to do whatever I want.
It's kind of hard to argue also-- If your doing a life sentence, who cares what you do? What can the state do besides gives you some solitary?
It's fucked up because by and large the corrections officers don't give a fuck and people in general have the attitude like - Dont do the crime if you cant do the time. While that may be true, nobody deserves to be ass raped by an inmate (unless of course your in jail for doing the same thing to someone else).
I will say this-- the whole homo rape thing should act as a detterant to people from committing serious crimes that would land you in a max security facility in the first place.