love-and-rockets
Explanation
The Joke
A child asks their father how to find "the one." The father says there is no such thing and explains that relationships work like a three-stage rocket. The first booster is called "lust" -- it gets things off the ground, so to speak. Eventually you run out of that fuel, discard it, and hit the second booster, which is called "affection." Once affection runs out, you switch to the final booster, "love." The child finds this touching: "That's so corny but so sweet." But the father finishes by saying: "Sure, anyway, after that you can coast on inertia for a good 30 years before things break apart."
The Humor
The comic sets up what appears to be a heartwarming father-child talk about the nature of love, using an clever rocket metaphor. Each stage of a relationship maps to a stage of a rocket: lust provides the initial thrust, affection sustains the middle portion, and love is the final stage. The metaphor is genuinely sweet and insightful -- until the father follows the rocket analogy to its logical and unflattering conclusion. Once all the boosters are spent, a rocket does not keep accelerating; it merely coasts on inertia until it eventually breaks apart. The implication is that long-term relationships, after exhausting lust, affection, and even love, simply drift along on habit and momentum for decades before finally falling apart. The child's moment of emotional connection is immediately undercut by this bleak but honest coda.
References
The title "Love and Rockets" is also the name of an influential alternative comic book series by the Hernandez brothers, as well as the name of a British rock band. The three-stage rocket is a real concept in aerospace engineering, where rockets shed spent fuel stages to reduce weight during ascent. The metaphor of relationships having distinct phases (passion, intimacy, commitment) also loosely parallels psychologist Robert Sternberg's triangular theory of love.