>>713
You're welcome! That's just about what I was rambling about, yeah.
Thing is, though, you really don't need classes to work on posing and anatomy. I personally like to people-watch and use posemaniacs (listed above) since I'm studying in a medical field and really don't have time for extra math classes. The issue isn't where you study, just that you do, in general. As long as you're constantly turning a critical eye towards your artwork, you will eventually learn and understand anatomy on its own. However, it does take more discipline to do this on your own.
For an example of good silhouetting, you may want to look at old Warner Brothers animation - just look up some old Bugs Bunny cartoons on Youtube or something, and pause through the more expressive actions. These old cartoons are really, really good at clear poses, albeit very, very exaggerated ones. Obviously you wouldn't make such exaggerated, cartoony poses with what looks to be your semi-realistic style, but I do find that drawing very loose, fast, silly sketches before hitting the "real" drawing helps keep my work from looking stiff.
Then again, in a masturbation pic, maybe that's the point. :V