Apparently these are all real places:

• Nobber (Donegal, Ireland)
• Arsoli (Lazio, Italy)
• Muff (Republic of Ireland)
• Bastard (Norway)
• Twatt (Shetland, UK)
• Twatt (Orkney, UK)
• Dildo (Newfoundland, Canada)
• Wankie (Zimbabwe)
• Climax (Colorado, USA)
• Lickey End (West Midlands, UK)
• Shafter (California, USA)
• Dongo (Congo - Democratic Republic)
• Dong Rack (Thailand-Cambodia border)
• Donk (Belgium)
• Intercourse (Pennsylvania, USA)
• Brown Willy (every schoolboy's favourite, Cornwall, UK)
• Lord Berkeley's Knob (Sutherland, Scotland)
• Shitlingthorpe (Yorkshire, UK)
• Stains (Near Paris, France)
• Seymen (Turkey)
• Turdo (Romania)
• Fukum (Yemen)
• Fukue (Honshu, Japan)
• Fukui (Honshu, Japan)
• Fuku (Shensi, China)
• Wankie Colliery (Zimbabwe)
• Wanks River (Nicaragua)
• Wankendorf (Schleswig-Holstein, Germany)
• Wankener (India)
• Shag Island (Indian Ocean)
• Sexmoan (Luzon, Philippines)
• Hold With Hope (Greenland)
• Beaver (Oklahoma, USA)
• Beaver Head (Idaho, USA)
• Wet Beaver Creek (Australia)
• Pis Pis River (Nicaragua)
• Tittybong (Australia)
• Dikshit (India)
• Middle Intercourse Island (Australia)
• Chinaman's Knob (Australia)