This porn video tag refers to the sexual orientation of the performers involved in the scene. In this case, there are two terms combined: "demisexual" and "pansexual."
Demisexual: A demisexual person only feels sexual attraction towards someone when an emotional connection has been established. This means that for a demisexual performer, the scenes in the video would involve forming some kind of emotional bond with their partner before engaging in sexual activity.
Pansexual: Pansexuality is the sexual attraction towards people regardless of their gender identity or biological sex. This means that pansexual performers can be attracted to people who identify as male, female, non-binary, agender, and others. In the context of this tag, it implies that both demisexual and pansexual performers are involved in the scene, showcasing a range of sexualities and attractions.