I recently discovered a great resource for posing and drawing reference. You don't have to be online to access them, and they're cheap. :)

Visual Reference for Comic Artists, Vol I and II on CD.

The CD's do not contain nudity, so they're safe for your kids to find. His site has a very limited list of places to purchase them, but personally I've gotten mine from BudPlant (NOTE: They do sell some adult material, so the link may contain nudity, but not unless you go looking for it), they're in California but they ship anywhere Internationally. (The CD-ROM's are $10 each.) Plus they're an actual walk-in store and not owned by a mega-corporation, kinda rare these days!

Have fun!

-Molly