women's names for their breasts

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my friend told me she has pet names for her breasts. one she calls shelagh and the other muriel. i forget which one is which. but it got me to thinking, do many women do this? and if so, what are the names you give them? why? i mean, i can't understand exactly why a breast would have the personality of a muriel but perhaps it does. can you explain please? no need to post visuals unless of course you'd like to.