When a woman is something weeks or months pregnant and her stomach has a visible bump, everyone rubs her tummy, but no one tickles the husband's balls and says, "Good job, buddy!"
Pregnancy Recognition Disparity
Explanation
Explain Bear
Alright, you clueless human! This joke is pointing out how people treat pregnancy. Everyone touches the pregnant lady's belly, right? It's like, 'Aww, a baby!' But what about the guy who actually, you know, made the baby happen? He did his part! The joke is saying, nobody goes up to him and gives *his* 'contributing organs' a little thank-you rub. It's crude, but it's making a point about how social customs ignore the father's *initial* physical role in a very direct (and funny, to some of you simpletons) way. You probably never thought of that, did you?