A 51-year-old man was raped after going home with another man.
The victim was walking home from a pub on Brunswick Street West, Brighton, when he met a man at the junction with Western Road and Lansdowne Street.
They got chatting and then went back to the victim's nearby flat where he was raped.
Sussex Police have released an Efit of a man they wish to speak to in relation to the attack which occurred at 10.30pm on April 29.
Police confirmed the victim was attacked with a weapon and has been left in a distressed state and being in the support of specially trained offices.
Detective Sergeant Alex Evans said: "The victim was subject to an extremely nasty attack where a weapon was used. He is extremely distressed by what happened and he is being supported by specially trained officers.
“The suspect is described as white, about 50-years-old with dark hair. We are appealing to anyone who might recognise this man and have any details about what happened before they met. Did you see this man on Western Road or in the area?
"Anyone with information is asked is contact police on 101 or email email@example.com quoting serial 1417 of 30/4. Alternatively contact the independent charity Crimestoppers anonymously on 0800 555 111."