http://www.pbase.com/mainecruising/installing_a_smart_plugThe invertor of the Shore power plug, and the Ciggy plug/receptacle, got together with Murphy and the DEvil to create one of the worst electrical connectors ever conceived.
And how many people will drage their electrical cords, male or female, through the dirt and give no thought to contact oxidation or the dirt inside the plug, or forcing a blackened copper plug into an equally ugly receptacle.
Try cleaning prongs and receptacles with Caig Deoxit and be amazed how nicely they slide into the outlet. FLIR would likely show a much cooler plug too passing the same Wattage.