Love and rain are often metaphorically associated because they share certain similarities, especially when it comes to the emotions and experiences they evoke.
Both are unpredictable: Love and rain can be unpredictable. You never know when you'll fall in love with someone or when rain will suddenly pour down from the sky. They both have an element of surprise and spontaneity.
Both can be refreshing and rejuvenating: Rain is known to bring life to the earth, nourishing plants and replenishing water sources. Love, too, has the power to refresh and rejuvenate us emotionally. It can make us feel alive and give us a sense of purpose and fulfillment.
Both can be soothing: The sound of rain can be calming and comforting, just like the feeling of being in love. Love can bring a sense of peace and contentment to our hearts, much like the soothing effect of rain on the mind.
As for lovebirds liking rain, it's more of a cultural or poetic reference rather than a biological phenomenon. The term "lovebirds" is often used to describe couples who are deeply and affectionately in love. When people refer to lovebirds liking rain, they may be alluding to the romantic and sentimental nature of rain, which can create a cozy and intimate atmosphere. Rain can inspire a desire to be close to someone, seeking comfort and warmth, which resonates with the idea of lovebirds being affectionate and staying close to each other.
In literature, movies, and art, rain is often used to set a romantic mood or to symbolize emotional depth and intimacy. So, the association of lovebirds with rain is more about the symbolism of rain enhancing the emotions of love and affection rather than any inherent preference that lovebirds might have for rain.