Item Girls and Item Numbers

Not sure who coined the word Item Number and Item Girl.
I feel it's very derogatory.

Wiki has a good explanation

The classic meaning of "item number" refers to highly sexualized songs with racy imagery and suggestive lyrics. The "item number" would feature an "item girl" who appeared in the film as a dancer, usually in a bar or nightclub, and was only in the film for the length of that song. It was often frowned upon at that point in time. Today, it is a commonly used term with hardly any negative connotations to it.

I personally don't like words like 'Item Number' and 'Item Girl'.

By the way, why isn't there a word 'Item Boy'.