I have three anatomy textbooks and one anatomy atlas. I just looked up the sections on male reproductive anatomy, and all three texts mention the prepuce and point it out in at least one figure. However, most figures or pictures are of circ'd penises. The worst of the three (Martini et al's "Human Anatomy" 4th ed.) talks about how the prepuce is a smegma trap, and smegma is great bacteria food, which means lots of inflammation and infections, but there's this procedure called circ which can prevent all that, blah blah :Puke. The second one (McKinley & O'Loughlin's "Human Anatomy" 2nd ed.) attempts to give a pro/con list, with pros being all that garbage about UTI and HIV prevention, and cons including babies aren't always given anesthesia and "might" feel pain. The third (Moore & Dalley's "Clinically Oriented Anatomy" 4th ed.) explains phimosis and paraphimosis and how they're reasons that adults would get circ'd. It says RIC is the most common surgery, often performed in certain religions though done mostly for nonreligious reasons, but gives no mention what those reasons may be. The one drawing they include of a flaccid penis has lots of skin wrinkles behind the glans, so I guess you could argue the foreskin is there, just retracted. I can't exactly give that one an enthusiastic thumbs up, though at least it's not offensive.
The best one I have is the atlas, Netter's "Atlas of Human Anatomy," 4th ed. It doesn't have text and so is probably not the kind of thing you're looking for. All the drawings of penises shown with skin, except for one, include a foreskin.
: But there's a whole paragragh about the clitoris. 
