I really don't think it's a myth. It seem's that the hung white men, on average, top out at around 8" or so, while the hung black men are far more common and usually larger. Race does seem to play a role in it; ask an Asian.

Donna, you may think that you want a man with a very large penis if you have never had one, but I'd caution that you may want to try a toy (large) and see if you like that first. I've met far more women who didn't like it, than women who did. JMO.