I don't know if he wants to read this or not, as it's probably going to scare the shit out of him, but this is a pretty accurate write-up on the subject:
RAPE IN PRISON
Like the article says, if it's a minimum security prison, then he can probably make it through just by keeping low, not pissing anybody off, and maybe pairing up with his cellmate if he's cool enough. In a maximum security prison though, you can pretty much be sure that a young, average build college white boy is going to be prime meat for most of the blacks there.
Suicide rates are very high in prison. Wonder why? A lot of men simply kill themselves after being raped. The kind of rape isn't going to just be some simple rape, it's going to be the kind that's probably going to leave the guy with blood gushing out of his ass while getting thrashed in the throat and face. The Aryan Brotherhood might not help much, either. A lot of those guys are just going to tell your friend to fuck off if he's small.
The cops aren't going to give a shit. They're going to think he's scum no matter what the circumstances of his sentence were. They're not going to grant him PC just because he feels threatened, and probably won't grant it even after he's been raped, because they just don't care. The only way to get solitary is to punch out a guard, and then that's not a good idea because they'll pull the bed out and back up the toilet, leaving him with no option other than to lie in a pool of diseased fecal matter. He'll probably wind up with a disease from this. This is the kind of this they don't tell you. The guards are just as every bit your enemy in prison as the black gangs are.
I'm sorry to say this, but no matter what happens, your friend's life is over. Even if he makes it back out into the world in his 40s, you really think he's going to have a nice life? How the Hell is he expected to find dates, land a nice woman to marry, get a job other than the restaurant biz, build credit, and a bevy of other things? He's not going to be able to.
Sucks.