Let Us Prey (2014)

Let Us Prey (2014) is a horror film starring Liam Cunningham of Game of Thrones fame. PC. Rachel Heggie (Pollyanna McIntosh) is a rookie policewoman arriving in a rundown town in Scottish. The green cup is there to work the nightshift for this first time in the remote and beaten up police station. A mysterious, weird stranger named Six (Cunningham) is captured and locked up with the other inmates. The loner slowly begins to take over the minds of the prisoners and the other cops as will, creating bloody mayhem. It's up the Rachel to either resist the evil mojo of this crazed psycho or fall victim like everyone else and let the insanity continue.   

The film features a rough scene where Sgt. MacReady (Douglas Russell) seduces a man who then beats him to death leaving him in his just his underwear.