In psychological terms, cars represent an important symbol of masculinity. They are often associated with power, control, strength, and aggressiveness. As such, they can be perceived as attractive to many people - especially males - due to their appeal to sexual desires that may be otherwise repressed.
It is unclear how car sounds play into this dynamic. Does the loudness of engine noise affect one's level of arousal? Are certain frequencies more arousing than others? How do different types of engines compare in terms of erotic intensity? These are just some of the questions researchers have been exploring for years. In general, studies suggest that both men and women find the sound of a high revving engine appealing. Research has also shown that women respond positively to low engine revs and higher gear speeds. While further study is needed, these findings indicate that there may be a connection between mechanical sounds and sexual attraction. Some people even report feeling "sexually stimulated" when hearing specific engine noises, suggesting a link between audio cues and psychosexuality.
It appears that the experience of driving may trigger fantasies or memories related to sex. One theory suggests that this is because cars evoke feelings of freedom and control, which can then be transferred to other aspects of life, including intimacy.
Individuals may associate driving with taking charge or being in control during intercourse. This could explain why so many people enjoy having sex in cars. Certainly, there is evidence to suggest that automobile-related sexual fetishes exist. Those who derive pleasure from mechanized items or machines may find themselves particularly drawn to vehicles.
The act of driving itself can heighten sexual excitement. Perhaps it is something about the motion or the physical sensations associated with acceleration and speed that make cars erotically pleasing.
Car sounds likely play an important role in our perception of eroticism. Whether they actually cause arousal remains up for debate, but they certainly contribute to the overall atmosphere of excitement and anticipation surrounding sexual activity.