At least not if you want to keep the educational content G-rated. I put together a slideshow on the Yakuza for the unit on Japan that I'm doing with my grade 7 social studies classes, and apparently some of the images that I used were too risque for the age group.
Here's the first one. I cropped it once already, but there's still too much crack according to my gentle but emphatic elders.
Here's the second, which I didn't think was that bad. Half of those kids will probably go home and play Grand Theft Auto: San Andreas tonight, anyway.
(I found these images at Illegal Economy and Flickr.com respectively via a google image search)