The provided word "aier" is not a recognized porn video tag, but based on the context and the fact that you're asking for an explanation, it seems like a typo or incorrect spelling. It might be related to "air", which could refer to various things in the context of adult content:
1. Air: Refers to the act of penetrating someone without using any physical force, often associated with blowjob and cunnilingus acts.
2. Airplane: A fetish involving airplanes or scenes that take place on airplanes, usually featuring passengers engaging in sexual activities.
3. Air Force: Similar to the above, but specifically related to military personnel in the air force.
4. Airtime: Refers to content with a high level of suspension and/or flying in the video.
5. Airbrushed: Content where models or scenes have been altered using digital editing tools to enhance appearance.
Please provide more context or clarify if none of these interpretations match your intended meaning.