The porn video tag "vakuumbett" is a German term that translates to "vacuum bed" in English. In the context of adult content, it refers to a sexual activity or scene involving a vacuum bed, which is a piece of BDSM or kink equipment used for restraining and positioning a person during sex. A vacuum bed creates an environment where blood vessels are temporarily compressed, leading to heightened sensations and increased vulnerability during penetrative sex. It's commonly used in BDSM play as a tool for power exchange and control. The tag indicates that the video features this specific type of sexual activity or setup.