Yep, thanks, still we don't know if it was because they are (now) considered somehow offensive of women or if it was because (even if protection was not enforced) they are copyrighted.

Or simply because they were sourced from Playboy magazine (which in itself is now deemed ethically questionable).

The statement on the page seems to me meaningless:

> they no longer represent the best examples for future research.

without the actual reason why they "no longer represent", which BTW implies that for some time (30 or 40 years + ) they actually were "the best examples".