The sudden recognition of their nakedness indicates the realization that their descendants, as well as themselves, would suffer the effects of this original sin. The ability and instruction to be fruitful, given by God as a unique blessing, now would also convey the Curse of sin and death. Adam was the federal head of the human race, and it was "through the offense of one many be dead" (Romans 5:15).

Source:

KJV Defenders Study Bible, by Dr. Henry Morris, Ph.D.
Publisher: Thomas Nelson
Language: English
DEF 10 ISBN 0-529-10444-x
DEF 10-1 ISBN 0-529-10445-8