hydrocarbons
Explanation
The Joke
This comic features a conversation between a woman and a robot or android partner. The woman says: "Gally, we need to break up." The robot asks why, and she explains: "My main power source is the burning of hydrocarbon compounds. Your body is full of them. To be clear, it helps if I tell you this is not a fetish thing."
The robot responds that it thought the main part of their relationship was imaginary -- that she was "running a simulation" of their relationship in her mind. The woman protests: "Wait, is this why you've been 'recharging' next to me at night? I thought that was a fetish thing!" The final panel shows the robot sheepishly admitting: "It's a lot of things, okay?"
The joke reveals that what seemed like a romantic relationship between a human and a robot was actually more of a predatory energy-extraction arrangement on both sides, with each partner secretly using the other as a power source or resource.
The Humor
The comic plays with the increasingly common sci-fi premise of human-robot romantic relationships, but subverts the typical "can a robot truly love?" question by revealing both partners were exploiting each other for energy. The woman's body runs on hydrocarbons (as all humans do, metabolizing food), and the robot was apparently siphoning energy while "recharging" next to her. The repeated callback to "fetish thing" adds a layer of awkward comedy, as both partners had rationalized the other's suspicious behavior as merely a sexual quirk rather than recognizing the utilitarian nature of their arrangement. It is a dark parody of relationships where both partners are using each other for different things while pretending it is love.