Where would the songwriter be without body parts to reference?
Without a noun to begin a simile.
Without an appendage/organ to verb.
Without a feminine feature to praise.
Thanks to this handy infographic (and the in-depth underlying study) we can see which body parts are preferred, and how frequently they’re cited, in an array of genres. “Ass” is tops in hip-hop, but “eye” is number one in, oh, basically everything else.