Depends on the girl and how much body hair you have. Most girls seem to fall in the category of liking a little body hair. They fall in this position because it makes you seem manly which is attractive. It also makes you seem natural and human. Personally I like a a wolverine type look, but there are those who don't. If you don't have a lot of chest hair just leave it alone, if you shave it, it'll grow back and get stubbly annoying and only grow in thicker each time you shave it.