"Breath control" in the context of a porn video tag refers to a specific technique used during sexual activities, particularly in BDSM and fetish play. It involves the dom partner controlling their sub's breathing by either restricting airflow through gentle pressure on the throat or by instructing the sub to hold their breath for varying amounts of time. This can create a heightened sense of submission and control, as well as leading to an increased feeling of pleasure and arousal when breathing is resumed. The tag "breathcontrol" is typically used to indicate that a video contains such activities.