I've done few "personal" nude studies, but quite a few commissions for individuals who, for various reasons want nude B&W photographs of themselves. I frankly find these very difficult sessions because there is a very fine line between "evocative" and "provocative." Clients
I think it's essential that there be an honesty between the photographer and model - nude or not - otherwise any uncomfortableness, (different to discomfort!) is clearly evident in the eyes.
I usually give the negs to the model as a form of adding comfort. None of them figure in my portfolio as, for commissions at least, I believe that while I may well have the legal rights to the images I should not ethically show these photographs to others. In fact I think a photographer should never display or show images that may embarrass a subject. This does not apply to photojournalism, of course; although even here I believe that the photographer should exercise some integrity.