Those photos have been around forever, 10 years, probably even longer than that. Almost as long as I've been looking at pictures of naked women on the internet!
I bet there's actually a thread on OCC with them. Yep, sure enough here's an Ultimate Frisbee thread:
https://forum.oneclickchicks.com/showthread.php?t=68304
It has some of the photos from above, as well as a bunch of others. It looks like one or two of these recent shots aren't in the other thread but look like from the same event. Just goes to show there are still some "classic" photos out there to be found.