This video from the USA says about itself:
21 June 2018
A new investigation has uncovered rampant sexual violence against Yemeni prisoners held in prisons run by the United Arab Emirates in Yemen.
The Associated Press reports that in March, 15 officers lined up the prisoners in the southern city of Aden and ordered them to undress before searching their anal cavities, claiming they were looking for contraband cell phones. The prisoners screamed and cried and those who resisted were beaten and threatened by dogs.
Hundreds of prisoners reportedly suffered similar abuse. A Pentagon spokesman quoted in the piece said the allegations were not substantiated. The UAE is a key ally of the United States and has partnered with Saudi Arabia in its military assault on Yemen.