It really depends how much. If he just has a bit of hair on his chest, then that's cool. Not if its like a gorrilla. If its gorrilla type hair then it would be a good idea to just get rid of it. I love a shaved/waxed chest if the guy has a 6pack or toned abs-a hairy chest can hide a good body. But if his body is average/ok, then bit of chest hair isn't going to make a lot of difference.