This thread has prompted a response from an occasional reader, who has worked in North Africa for a long time:

The use of sex in all kinds of contexts is under reported because we tend to fantasise about such situations or to have strongly held prejudices which we like to project onto societies we know little about. Sodomising - man to man - is common in Western prisons, many "Imams" use it as have done many priests. It is not particular to one culture or one religion. When men are together in a system where domination, fear etc predominate, it happens.

Among fundamentalists, it is, as far as I know from North Africa quite common but the police use it in non-democratic societies to humiliate. There was a famous Egyptian novel and film a few years ago which showed how such humiliation in a prison led directly to terrorism. In Nasser's Egypt, because young officers did not have enough money to marry, some were recruited by fundamentalists posing as male seducers.

Meanwhile in Arab country women may be oppressed but they - and gay men- find many ways around the social rules.
I will try to identify the film cited.

Tequila,

Yes, maybe there is not much data on this subject. I suspect there is data scattered around, in specialist country reports and the whole subject IMHO appears "off limits" to Western states.

In the UK the scandal around and involvement of the "ruling class" in the Kincora Childrens Home, in Northern Ireland, is the readily recalled example of the sensitivity, not as a factor in radicalisation. Have a peek at:http://en.wikipedia.org/wiki/Kincora_Boys'_Home