I remember the first time I had sex - I kept the receipt.

The line is a classic one-liner built on incongruity: a private, intimate experience is treated like a commercial transaction, complete with a “receipt.” The humor comes from collapsing romance into bookkeeping, a satirical jab at prudishness, commodification, or the tendency to narrate life as a series of purchasable milestones. It also fits the broader tradition of American vaudeville/Borscht Belt-style jokes that use blunt sexual candor paired with a deadpan twist. Even when attributed to Groucho Marx, the joke’s structure is more important than any specific autobiographical claim; it functions as a self-contained gag about memory, value, and cynicism.

I remember the first time I had sex—I still have the receipt.
I remember the first time I had sex; I kept the receipt.
I remember the first time I had sex. I got a receipt.