I think almost everyone looks better, younger, healthier, with hair. Any woman who thinks a guy is attractive who has a shaved head or bald would think your just as good or better with hair. If your black or hispanic you can probably pull it off better than a white guy. The whole juiced up Mr. Clean look on a white guy is not optimal, but if your hair falls out you don't have much choice. I think some people are fooling themselves with the whole "bald is beautiful thing." I equate that to the "size doesn't matter" saying and women know that's not true on both accounts.
Yes, size matters, I won't lie. Bald or not doesn't. How do you know what's optimal for a woman? Are you a gay man? I have a ton of gay friends, and what's in now is a shaved head, facial hair, and chest hair. Yes, chest hair! It's huge in the gay community right now. Actually, I prefer a man with hair on his chest too. I love a nice shaved chest and stomach, but there is something manly about some chest hair. Not gorilla status though, but a man who can't grow chest hair is a huge turn off.