half
Explanation
The Joke
A couple is in bed together, and the woman enthusiastically tells the man: "Wow, really? You... you mean it?" He confirms: "Yes, my love." She then explains the significance: "Every time we have sex it takes half as long for me to orgasm." This sounds like it should be good news, but the next panel reveals the darker mathematical implication. The man says: "With each lovemaking, we approach infinitely close to our entire lifespan." The woman, exasperated, begs: "Please, please can we talk about this instead of doing a math thing?" In the final panel, she is shown lying in bed with a thought bubble: "That for half an episode he could just be hot."
The joke is built on the mathematical concept of a convergent series -- specifically, a Zeno's Paradox-style situation. If each session takes half as long as the previous one, the total time spent across all sessions would approach a finite limit (a geometric series summing to twice the first session's length). The man, however, seems to be describing the opposite: that each session takes half of their remaining lifespan, which would mean they asymptotically approach spending their entire life having sex without ever quite reaching it.
The Humor
The comedy comes from the collision between what should be a romantic or intimate moment and the man's compulsive need to turn it into a math problem. The woman's frustration is relatable -- she wanted a tender moment, and instead got a lecture on infinite series. The final panel adds an additional meta-joke, with the woman apparently wishing her partner could just be attractive without overthinking everything, a sentiment familiar to anyone who has been in a relationship with someone who cannot resist analyzing everything mathematically.
References
The comic references Zeno's Paradox, particularly the dichotomy paradox, where a distance is repeatedly halved, creating an infinite series that converges to a finite sum. It also plays on the concept of geometric series in mathematics.