His idea of a sexual conquest—according to security officials and to acquaintances who knew him at the time—was to force himself on younger men as a way to humiliate and assert his own dominance.
I'm not sure how I feel about this -- it's clearly hearsay and rumor, and just using the anti-gay bigotry of the Islamic world as a club to smack Zarqawi with, but on the other hand, he is a scumbag and deserves to be beaten with all the clubs available.
If the author feels compelled to report on unfounded rumors, rather than making Zarqawi a gay (or bisexual) rapist, and continuing the stereotype of gay men being predators, why not just make him a pedophile?