I will be doing a nude shoot, where I want the model's skin to have a very soft "shine" to it. Just enough to enhance the highlights of her muscle tone. But, it's very important that it doesn't make her skin slippery, as some of the poses will require friction between parts of her body, in order to hold the pose. Specific brands would be helpful. Thanks! 

You might ask in the Hair/Makeup forum--Those guys & gals have been very helpful in the past on questions such as this.

Sometimes I have girls put on some body lotion.  Some of the lotions even have bronzing effect.  I stay away from spf lotion but don't remember why.

Also cheap body lotion works better.  Lotion is basically an oil that protects your skin.  The more expensive ones don't feel oily.  I like the more oily effect of cheap lotion.

Thank you!