Think about it

Last night I was up and awake in the middle of the night like I usually am and I thought of something. In song lyrics why is this always a specific well known cliche phrase? Something like 'my heart beats for you' or whatever. You could create a heap of different sentences with that same meaning, but I was just wondering why isn't it ever something like 'my brain sends electromagnetic energy out for you' or 'these neurotransmitters transmit messages around my body for you' hahaha. Those phrases are just plain stupid altogether.