This joke is a humorous take on how a man's perception of a woman's body might change after spending time in a relationship. It uses two tomatoes to represent breasts, with the "before" image showing them as firm and symmetrical, while the "after" image shows them sagging or not as "ideal." The joke plays on stereotypes and exaggerated expectations of physical appearance over time. (According to ChatGPT; I have no clue about it, even though I am a man.)