I thought the t-shirt might be a reference to the importance of breast feeding.
I think I now understand the t-shirt. The t-shirt implies that we should attach ladies to milking machines and sell the milk.
I recall reading a dystopian short story from decades ago about hooking up women to milking machines. The women were still women. Yet, they were bred in such a way that they were slightly different from normal women. Their breasts were huge. They were also naturally sexually attractive. The moral of the story is that we reduce cows to the value of how good their milk tastes. Similarly, we also objectify women by their ability to satisfy men in bed.
The story appeared in a science fiction anthology several years after Penthouse magazine rejected it. The editors of Penthouse said that the story was too raw and disgusting. Unfortunately, I can not recall the title of the story.
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Things have changed so much in the last 40 years. If a thirteen year old boy had sex with an adult female, the boy got lucky. Nowadays, it is child abuse. So many adult ladies tried to get in my pants before the age of 17, that I lost track of them all. I was so grossed out. I was also a little proud when I told my dad about the encounters. My point is that sexual objectification cuts both ways.