As a child I remember my Mom having a go at my Dad when he was driving through towns and a pretty woman caught his eye and his gaze automatically followed her legs, ass, face - whatever. I can remember my Dad colouring up and being evasive about it. It always ended up in a row of some description.
We however actvely tell each other what we like or don't. One of us spots a person and says mmm like the look of them etc. Too which the other would say really?? no way! or yeah well spotted ... If we both spied a person we both thought yeah! to hwoar: it has been to known change the atmosphere and the conversation in the car to good/sexy/raunchy for the rest of the journey
It is a nice freedom to be able to be honest about things such as this don't you think?