I'm too tired to actually come up with something.
B u t ,
It'd be based on ``romanticizing.``
Let's say, a feeling, or a physical meeting given sexual appeal cuz of the involved people's perceptions.
Touching a stranger's hair is . _ .
while doing the exact same thing with your partner is .-.
the only thing that changes between both encounters, is the persons' feelings about wHaT the touch means. The touch is still just a touch. It could make you horny, or it could make you wither in disgust.