For something like that, the hair was likely painted onto the rendered image in postwork.

It is possible to create the illusion of body hair in Poser itself, but the transparency map is not applied to the character's body, because then you could see through the body. Rather, it's applied to a prop or conforming figure attached to the body.

For an example of how this might work, study some of the transmapped pubic hair props in Free Stuff, at this and other sites.

Oh, and Anton has an impressive transmapped beard for Michael over at DAZ.