"3D" refers to the three-dimensional nature of the content, which means it is represented with depth and perspective, often creating a more immersive experience.
"Machine" in this context likely refers to the use of machines or technology as part of the bondage scenes, possibly involving equipment like metal restraints, gimbals, or other mechanical devices for BDSM play.
"Bondage" is a common theme in BDSM (bondage, dominance, sadism, and masochism) content, where one or more participants are physically restrained, bound, or tied up as part of their sexual experience. The focus is often on power dynamics, submission, and control.