TWO men flashed the occupants of a house in Harrow Street, Grantham, on Tuesday.
Police officers were called after the incident in which the pair exposed themselves through a window, at about 4.20pm.
The first suspect is described as being in his mid-30s, with a shaved head, stubble and wearing a black puffa jacket. The second is described as being in his late 20s.
Anyone with any information or who saw anything suspicious in the area at the time should contact Grantham Police Station on 0300 111 0300 or call Crimestoppers anonymously on 0800 111 0800.