ultra
Explanation
This comic imagines an absurd consequence of radically extended human lifespans.
A person sits at a computer. The screen asks: "Are you over 10^18 years of age?" The person responds: "What the..."
The caption reads: "The most unexpected result of increased human lifespans was the existence of Ultraporn."
The joke works on multiple levels. First, 10^18 (one quintillion) years is an astronomically large number — far beyond the current age of the universe (about 1.4 x 10^10 years). The comic imagines a future where humans live so long that age verification requires scientific notation. Second, it implies that if humans lived for cosmological timescales, pornographic content would escalate in ways that are unfathomable to current humans — hence "Ultraporn" requiring an age gate of a quintillion years. The person's shocked "What the..." suggests that even in this far future, there are still things that can surprise people.
The humor lies in taking the concept of age-restricted content and extrapolating it to a ludicrous extreme, suggesting that no matter how long humans live or how advanced civilization becomes, there will always be someone pushing the boundaries of what requires an age check.