How can I safely search for elegant adult nudes without the search yielding underage and hardcore images?

I'm working on using Boolean search logic with mixed success on Yahoo. I gave up on searching for beautiful nudes in natural settings on Google. The purpose of my search is to find models to use for drawing, watercolor, oil and sculpture. I find inspiration with the beautiful female form. Thank you for ideas or assistance, Lionel.

Deviant Art has some great tasteful images.
go to www.deviantart.com
then browse
then follow the easy sellection tab
Categories
Resources>stock images>model>
>Female>nude> Formal/Classical
or
>Male>nude> Formal/Classical
These are stock art so the models understand that you are using the images to create art, many have some rules on their page but most aren't intrusive.

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