Cruel and sadly all too usual

Terrific post over at Shakespeare's Sister on rape in America's prisons. I thought one of the best comments was:

It's interesting that there is an enormous amount of political effort being exerted to prevent consensual homosexual relations, but those same folks don't have a lot of energy at all invested in preventing same-sex rape. To me that says a lot about their priorities.

I haven't seen any comparative statistics on rape in British v. American prisons, but anecdotal evicence would appear to suggest that it's less prevalent here. Anyone have detailed comparisons? And if it is less common, any suggestions as to what we're doing right?