Significance of hair parting
Nearly all men part their hair on the left, even if they are left handed; and this widely is thought to suggest masculinity and assertiveness. Following this dictum, in the Superman movies Chris Reeve parted his hair on the left when in the Superman character, but on the right when in the Clark Kent character. George Reeves just had his hair combed back on both sides with no clear part when playing both Superman and Kent. His natural widow's peak added to the symmetry.
This partless style appears to have been Reeves's natural hairstyle and one he maintained in various roles as well as when not acting:
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The universe is not only stranger than we imagine, it is stranger than we can imagine.–J.B. Haldane