(Portland, OR)  --  Police say a suspect is on the loose after an armed robbery at a lingerie modeling shop in Portland.  Authorities say the man entered the Pussycats shop on Northeast 82nd Avenue early yesterday morning, displayed a gun and demanded money.  Police say he sexually assaulted a female employee before leaving the store.  Investigators say the robber is described as a tan man in his 20s, about five-feet-five.