Corel Painter VIII
One good thing about the internet is that there is an abundance of nudie-pix available for drawing from. That's handy when one has limited access to nudie-actual-people to draw from. The down-side is that a relatively tiny proportion of the nudie-pix aren't actually positively pornographic, and of those that fall into the not-porno category, even fewer are of men. The photo I drew this from I'd describe as cheesecake; there's quite a bit of that about.
I do enjoy life drawing, but drawing from photos is a decent second-best. One really good thing about photos: they don't move when you're in the middle of drawing their arm.