Yes, to get it to apply to the whole body, you’ll need to select all the body’s skin surfaces. I think this is the list:
(There are additional surfaces for eyes, fingernails, etc., but you may or may not wish to put the color on those.)
You can select these as a bunch and apply the color, then select them one at a time to adjust individual parts.
This tutorial is on a different (slightly related) topic, but the screenshot shows how to find all these surface regions: http://rawart3d.deviantart.com/art/Sub-Surface-Scattering-in-DS-306744678 And it’s a good tutorial, too!