Men and women love cars because they represent freedom, power, and adulthood. Women in general just don't spend every weekend windowshopping at the dealerships or go to the auto shows, but how many moms of more than 1 kid DON'T own a big vehicle? (They did their shopping.)
Men love their own car, looking at cars on the roads and in dealerships, and going to car shows because they love the power and can appreciate the designs of the vehicles. A car can get you halfway across the N. American continent in one day--that's power, another thing men love (and women).
A man's first car gives him a lot of power. He can go anywhere he wants, he has a place to make out with his girlfriend, and he has a life-size model of the Matchbox® cars he played with as a kid, and it offers no end of possibilities to tinker with things (something girls are generally discouraged from doing growing up--playing with Matchbox cars and tinkering with things).
A shiny, glistening car that's perfectly detailed and brand-new at a dealership or auto show is almost impossible to resist touching, though you know you'd ruin the perfection of the finish temporarily and someone would have to polish that section again. The colors are rich and deeply embedded into the vehicle. You know that the engine under the hood is increadibly powerful. Get in the car, and you get the almost intoxicating "new car" smell. The elaborate dashboard is the window into the car, the command console. The seats are so comfortable, and the material is clean and soft or it's rich leather.
Put it all together, and it's really quite easy for anyone to fall in love with cars. Airplanes, too.