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It's going to be a turn off to most younger women although if you have a strong jawline and a great physique with a tan, it will be the opposite. The issue is that most men don't have the face shape and jawline to pull off completely bald. I've been completely bald from what I was in the military and it didn't look good. Most of the other guys I was in with didn't look too great with a completely shaved head either.
Having a full head of hair is a sign of youth and youth is attractive. Balding = aging although some will correlate to wisdom which is sexy. So I think most women would prefer a full head of hair but that's not to say being bald is the kiss of death. It's dependent on a lot of things and it's also dependent on the girl's taste in men.