Technically speaking it's not a man who has sex with cars. As I'm one such I know my subject. An autophile is in love with him or herself sexually. So I'm stuffed for a good word to use (apart from the often heard, insane, crazy, etc). The only alternative I've heard is automobiliphilia. Quite a mouthful, more than the gearknob of a Jaguar XJ8 so probably won't be popular. There probably should be two words. One for a person who loves his car on every level and has it as a substitute totally for a human partner and one for a man who simply fucks it.
Since I'm simply adding a correction to a word, not sure what a relevent example would be. Apart from mentioning that I myself am an avid automobilophile, not autophile (not the only thing in my life mind!).