The internet! It's full of NSFW stuff!

Bing. No joke, it has a MUCH better image search engine then Google.
YIf you know what TYPE of pose your looking for, go to google, type in the keyword and put tumblr at the end of it.
Or experiment with different related keywords, it can be a chore, but its what I do when I want something specific.

Really? Huh! Thanks for the tip~

I second Bing. I use it for all of my NSFW references. :3

If you don't want to sift through the possibly seedy underbelly of the Internet, the built in 3d pose dolls in Clip Studio are a pretty nice alternative. (Assuming you already have something in mind.)

I do actually. I have never heard of clip studio o: I am learning so much with all of these journals xD I love you guys.

Never used the dolls, but seconding Clip Studio! It's a lovely program!

It's also sold as Manga Studio 5 for the boxed version. No idea why it has two names.

http://imgur.com/gallery/oi89Kd0

Click 'next' on the right side, then 'previous' to be able to see the links.
There's a ton of different pre-categorized stuff there.

Holy cow no kidding. Thank you! <3

Tumblr is a good place for references, though it can be hard to find anything even remotely specific. Or taking your own photos works as well. I've certainly done so when I couldn't find what I needed.

Mm, yes. This is a good idea, I've heard tumblr a lot so I'll have to poke through there some~ If I really can't find anything I can whip out my crappy camera and have Dash take a couple photos for me.

I use Tumblr for photo refs. I don't care to see if they're stock or not, simply because I rarely copy the pose exactly. I just take a few pieces, or the general idea. I find Tumblr generally has better quality than Google images.

^ Exactly, like I used a piece of stock imagery for that piece of Seishuku I just did but it changed so drastically I didn't really feel the need to credit?

I usually use thehun.com

Check their "overflow" section to sort by type.

I kinda stopped using stock a long time ago. I got frustrated trying to find poses that I liked. I use DAZ studio now and build models into poses I want.