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This image may be less 'seductive' than you imagined. Until later in the century, restrictive norms about women's bodies resulted in suggestive images of attractive women rather than overtly sexy ones. This is an earlier example of The Seductress, which employs pose and facial expression rather than nudity. The Fiat 'mechanic' we see here is a beautiful young woman staring seductively into the camera, posing to show off her legs and her high heels. Advertisements from automakers themselves tended to err towards these more conservative images, while auto parts manufacturers were much more raunchy, as you will see below. Regardless of dress, the visual rhetoric of seduction was (and is) common in car advertisements.
By the seventies, images of women in car advertisements became much more 'sexy.' Gratuitously posed to show off her body to the camera, the model in this advertisement has been placed to draw in male viewers. The "Dodge Scat Pack Club" patch on the seat of the woman's pants is a reminder of the product being advertised that has been placed in a location of 'visual interest.' As is common in the trope of The Seductress, the woman in the advertisement is not interacting with the car being advertised. She is neither driver nor passenger. She is simply another part of the set, another visual element designed to draw attention.
Parts manufacturers were much more daring with the images of women they employed. For this Playboy ad, Firestone managed to sexualize something as mundane as the tire. This sort of sexually suggestive image is not at all unusual. In order to sell its tires, Firestone attempts to seduce buyers by showing an image of a nearly-naked woman. There is only a tangential relationship between the visual content of the advertisement (a countryside tryst) and the product being sold (tires). It is suggested that the innuendo ("whatever your plans") is made possible by high-quality tires. The woman really has nothing to do with the product, but that doesn't really matter—as long as she catches your eye, Firestone has gotten what it wants.