>>6great question, fellow carbon-based lifeform
Porn is illusion that is daydreaming sex.
Not a simple optical fallacy, its a memory entrainment which saturates storage with sexual imagery and sound.
The mind is constructing a story and adds visual components.
A dream is built to reach a point of orgasm.
Sex itself is a dream with more senses attached: bodies used as masturbation devices to pleasure each other while a scenario of imagined sexiness occurs.
There it is, the porn is actually a narrative where humans masturbate themself to aid other humans masturbating alone. A chain of self-pleasuring hedonism and loss of vital fluids.