ANSWERED! Origin of "Sex Object" or "Sex Objectification"

Greetings, o wise ones

I've poked the standard free searches available to me and haven't found out who first used the words "sex object" to describe how patriarchal culture defines women as nothing more than a being with whom to have sex.

I'm looking for the coiner of phrases like:

He whistled at me then pawed me like a sex object because I wore a skirt

He asked my husband where he worked; he asked me how many kids we have. I hate that kind of sex objectification.

Feel free to signal boost!