How does this explain the rape and the forms of torture they used on him? I think they were aware of his past, and this was part of the reason for the attack.
rape of an enemy is common in the muslim world particularly in the middle east.... read about Lawrence of Arabia
No, male on male rape is very common dominance behavior in primitive cultures. It is used in the ME to express contempt for the person who has been captured or subdued. They raped Khadaffi, for example.
It has nothing to do with sex.