Why do people call each other love bug?

People call each other "love bug" as a term of endearment, often to express affection and warmth in a playful manner. The phrase conveys a sense of intimacy and care, often used among couples, friends, or family members. It suggests a lighthearted and loving relationship, evoking the image of someone who brings joy and sweetness into one's life. Overall, it's a charming way to strengthen emotional bonds.