On a totally off-topic note, Category:SuicideGirls looks to me like preview pictures to promote a commercial site. While I can see some use for some of those pictures (like piercing articles, etc), the collection as a whole would not fall ,at least IMHO, under "Must be realistically useful for educational purpose". How is it any different than the tons of "preview" material available to promote the zillion porn sites save, of course, for the license? (probably this question should be somewhere on commons, but I am not a frequent commons user, I apologize for the off-topic).
In any case, aside from the usefulness of the images, I do not see any rationale for the existence of the above category.
Cheers Yaroslav