First of all, most people in the field were unaware that the classical "Lenna" headshot came from Playboy, or from "pornography" in general. You may be overlooking the fact that some cultures don't consider her fully-nude photograph pornographic at all, while other cultures consider even the headshot pornographic. "Pornography" is not a very useful term of art... any art.

Second, women researchers are more than welcome to choose their own reference images.

Third, you aren't just condemning computer graphics researchers, but practitioners in fields from advertising to art to athletics to zymurgy. The female face (and form) has been celebrated for aesthetic and artistic purposes in every civilization this side of Afghanistan.

In short, I don't think I want to live in your world. I hope I continue to have a choice.