turn
Explanation
The comic is rendered entirely in white-on-black, suggesting a dark or intimate setting. One voice says: "C'mon baby, we each do a quarter rotation and we can hit 180 degrees! It's possible!" The other responds: "But... why?" The first explains: "To become a single, MOIST surface, transcending orientation." The caption below reads: "We later broke up due to Edward's lack of interest in the Mobius 69."
The joke is a mathematical sex pun built on the topology of a Mobius strip. A Mobius strip is a surface with only one side, created by taking a strip, giving it a half-twist (180 degrees), and connecting the ends. The comic imagines a sexual position -- the "Mobius 69" -- where two people each rotate a quarter turn (totaling 180 degrees of twist) to become "a single, moist surface, transcending orientation." The word "orientation" does double duty: in topology, a Mobius strip is a "non-orientable" surface (it has no consistent inside/outside), while in everyday language it can refer to sexual orientation.
The humor comes from applying the precise, clinical language of mathematics ("single surface," "transcending orientation," "quarter rotation") to describe a sexual act, creating an absurd collision of registers. The punchline -- that they broke up because Edward was not interested -- treats this bizarre topological sex act as a mundane relationship incompatibility, like one partner not liking the same restaurants. The emphasis on "MOIST" in bold italics adds comedic revulsion, playing on the well-known discomfort many people feel about that word.