Concept art takes us to strange worlds and expands our imagination — but sometimes, it's also as sexy as hell. You can't look through the artist galleries at CGHub, Concept Art World and other sites without finding some concept art that's basically pin-up art as well.

Here are 30 or so of our favorite concept art pin-ups. Some of them are NSFW, but those are towards the bottom.

Top image: Penguin Pin-Up by Yoitsi on CGHub

Pin-Up in the Sky by Ferrick on CGHub.

Assassin by Pascal de Jong, via Concept-Art.org

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Visitors in the Drowning Pool by Matt Dixon, via Concept-Art.org.

Rocket Girl by Michal Suchanek via Templates.com

The Girl, the Chainsaw and the Were-Squirrel by Papa Ninja, via Templates.com

Space Opera by Isra on CGHub.com

Lucyfer by Matt Dixon, via Concept-Art.org.

By Jason Chan, via Concept-Art.org

Armored Lass by Arne on CGHub.com

Scifi Undress by James Wolf, via Concept-Art.org.

"Journey" by Randis, via Concept-Art.org

"Choices of One" by Mandryk, via Concept-Art.org

Bruna by Charles Liu, via Concept Art World.

Tarzan by Mandryk, via Concept-Art.org

Vamp by AGGELIKI OIKONOMOU, via Concept-Art.org.

By SyncMax, via Concept-Art.org

By Tanya Wheeler/Celestria, via Concept-Art.org.

Elven concept by Ashley aka Lithriel, via Concept-Art.org

Clint Cearly, via Concept Art World

Lucas Graciano, via Concept Art World

Firefly by Pascal de Jong, via Concept-Art.org

By Sang Han, via Concept Art World

Dragon Hunter P by Pablo Fernandez Angulo, via Concept-Art.org

Cazadora by Pablo Fernandez Angulo, via Concept-Art.org

Flyborg by Randis, via Concept-Art.org

NOXIZMAD/Massive Black Inc., via Concept-Art.org

DD Pinup by James Wolf, via Concept-Art.org.

Coppertone Girl by James Wolf, via Concept-Art.org.

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Dren from Splice by Peter Konig, via Concept-Art.org

By Nacho Molina (tutorial at the link)