Mechanophilia
Mechanophilia is sexual attraction to machines — cars, motorcycles, planes, robots, and mechanical objects. It spans a range: some are aroused by the machine itself (its power, curves, sound, or the idea of a robotic 'partner'), while others center on having sex in or on a vehicle. The blend of raw power, sleek design, and taboo drives the fantasy. Robot and android attraction is a popular modern branch. It sits among object-focused fetishes and sci-fi-flavoured fantasy.
The appeal can be the machine's power and aesthetics — speed, chrome, engineering — experienced erotically, or the fantasy of a tireless, controllable robotic partner. For the 'sex in or on a vehicle' branch, it's the setting, vibration, and thrill that charge it.
It might mean incorporating a beloved vehicle into sex (on the hood, in the back seat, the rumble of an engine), roleplaying a robot or android partner, or fantasy and art centered on machines. Robot roleplay may involve costumes, stiff movement, and 'programming' talk.
Depends on the form: sex in or on real vehicles brings mundane hazards — burns from hot metal, awkward positions — and should stay well away from a running engine, moving parts, or public roads. Robot roleplay is low-risk. Keep it clear of any genuine machinery that could injure.