I have looked at the official studies some time ago. The most recent investigation I looked at was http://www.hrw.org/reports/2001/prison/report.html http://w

I have looked at the official studies some time ago. The most recent investigation I looked at was http://www.hrw.org/reports/2001/prison/report.html http://www.hrw.org/reports/2001/prison/report.html which, based on academic studies suggest that 22% of male prisoners have been pressured or forced to have sexual contact against their will while incarcerated. That report also noted that official figures often massively under-report incidence of abuse. Anyway, you only have to watch US comedies, including those aimed at young people to see that prison rape is considered a joke, and a tame one at that. That's what I mean by 'cultural acceptance'.