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1.
Primarily, Japanese anime that relys heavily on showcasing mecha: robots/spaceship/fighterplanes/war machinery-heavy action. Particularly when they are engaged in violent combat and especially if the mecha are transformable.

There is no sexuality or actual 'p0rn' as the focusunless it is a doujinshi or hentai fan svc. storyline. The visually riveting & gratuitous element is the visceral & bloody nature of such combat and the war-romance of glamorized, high tech machines destroying each other; as visually addictive to tech-nerds as actual sexual content eg:

Massive exchanges of ordnance and stunning dogfight/combat maneuvers against cityscapes, alien environments or amidst massed fleets of capital ships and blossoming,null-'G'explosions; detailed, 'motion-physics' accurate and almost photo-realistic depictions of soldiers/pilots decompressing in hard vacuum, being eviscerated or burned alive; depictions of ordnance impacts and nuclear explosions, incl. progressive flash/blast/heat, that have otherwise only been captured with motion picture cameras using strobes, frame progression and other photography tricks.

Can apply to non-Japanese, SF motion pictures replete w/the aforementioned.
Did you watch the 3rd episode of Gundam:Unicorn?-Total mecha porn!!!
by Drainfly-IV-Alpha February 24, 2011