Starting cars without keys is a new trend that is changing how people interact with their vehicles. The process of turning on an engine without using keys can be seen as a psychologically arousing experience for some drivers, leading to increased levels of emotional investment and bonding with the vehicle. This phenomenon has been called "keyless car arousal" or "car sex." There are several factors contributing to this effect, including primal instincts related to territoriality, power dynamics, and the ritualization of car start-up procedures.

The keyless ignition system creates anticipatory tension by delaying gratification until the driver presses the button. As they wait for the engine to turn over, drivers may feel a sense of excitement or anxiety that is similar to the anticipation of sexual arousal. The act of pressing the button also involves a physical gesture, which adds an element of sensory stimulation to the experience. For some people, the sound of the engine starting up can even create a feeling of pleasure.

One study found that the keyless ignition system activates the same parts of the brain that respond to rewards and pleasurable experiences, such as food and social interaction. This suggests that the desire to push the button is linked to primitive drives for survival and reproduction. In addition, the ritualized nature of the start-stop procedure can create a sense of familiarity and comfort, which can heighten feelings of attachment to the vehicle.

Some researchers have suggested that the keyless ignition system could play into fetishistic fantasies about automobiles.

Someone who enjoys the smell of leather seats or loves the look of chrome might be more likely to become aroused by their vehicle's appearance and tactile qualities. Others have noted that the act of driving itself can be a source of eroticism, with the movement and vibrations creating a feeling of intimacy between the body and machine.

While the connection between cars and sex is not new, the technology behind the keyless ignition system has given rise to a unique phenomenon that may appeal to certain individuals. For those who enjoy the thrill of anticipating and controlling a powerful machine, this effect may add an extra layer of excitement to every drive.

It should be noted that these psychological responses are subjective and individual, and not everyone will find the process of pressing a button to be erotically stimulating.