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In other words - images, unable to be tactile, an inability to make sensuality palpable irrupts strange fetishes: pornography must materialize its sensitivities by finding visual equivalents for touch. Textures which express similar reactions in viewers. You see it in taut inflated anime breasts, shiny PVC covered genitals, leather, sheers, frill, an entire wikipedia article about "breast physics." The ornate knots of bondage are totems to the practice. Art too in attempts to manifest materiality in what that cannot be touched must adopt hyperbolic visual equivalents. Bodies that photograph well.
See too: Olga Balema at High Art