"I think we should use this naked picture of a hot white chick as reference imagery" Lena is not visibly naked in the reference imagery, so, your point is moot

"I think we should use this naked picture of a hot white chick as reference imagery" Lena is not visibly naked in the reference imagery, so, your point is moot. It was always a cropped image, and it was cropped for exactly the reasons you outlined. If you, or others, cannot look at Lena without sexualizing her, that isn't the fault of the image, that's the fault of the viewer. Lena was used because that image is very difficult to reproduce/compress/etc, and that has not changed.