Witnesses say Yemeni guards working under the direction of Emirati officers use various methods of torture and humiliation.
Yemeni men are reportedly being sexually tortured in secret UAE-controlled prisons where they are held without charges or trials.
The alleged abuse follows a cycle, with detainees apparently beaten on day one, tortured the next, given a break on day three and then put into solitary confinement on the fourth day until the cycle begins again.
One detainee explained the torture and sexual abuses through drawings which were smuggled to the Associated Press from the Beir Ahmed prison in the southern city of Aden.
The drawings, made on plastic plates, illustrate human rights abuses by UAE officers.
They show a man hanging naked from chains while he is being subjected to electric shocks, another inmate on the floor surrounded by snarling dogs as several people kick him and graphic depictions of rape.
“The worst thing about it is that I wish for death every day and I can’t find it,” the detainee said.
He was in detention for nearly two years for speaking out against the Emiratis in public.
