"Matchbook Black Book" by Glassjaw is a song that explores themes of sexual desire, addiction, and infidelity. The lyrics paint a vivid image of a sexual encounter, depicted as another notch on a bedpost, symbolizing promiscuity. The opening lines, "Another notch on her bedpost, In blood red," suggest that the protagonist is engaging in a sexual encounter with someone who is experienced or has had multiple partners. The use of the phrase "blood red" adds an element of intensity and perhaps even danger. The repetition of "Feel me, Taste me" emphasizes the physical nature of the encounter, highlighting the raw passion and desire between the individuals involved. The lyrics "Warm me with your tongue of fire" and "Use this body" further convey the intensity of the encounter, depicting a craving for both physical and emotional connection. The chorus describes the protagonist's desire for this intense encounter to continue, pleading to be warmed and used, suggesting a yearning for the connection that this sexual encounter provides. The use of the phrase "Devil addictions" implies that these intense encounters are driven by a dark desire or addiction that the protagonist is struggling to control. The lyrics "Lie with another, Mostly each other" suggest that the protagonist is engaging in infidelity, lying to their partner as they participate in these sexual encounters. This highlights the theme of secrecy and betrayal, as the protagonist seeks physical satisfaction outside of their committed relationship. Overall, "Matchbook Black Book" delves into the complex and often destructive nature of sexual desire, addiction, and infidelity. The song conveys a sense of both longing and guilt, as the protagonist pursues intense encounters while grappling with the consequences of their actions.