So if Noah and his wife only had sons, how did they repopulate the world after the global flood?

@LordShadowfire marrying cousins isnt incest, and the next generation would be marrying second cousins.

@TheWildEcho It isn't incest as it's defined now because their children could find people who aren't related to them to continue the bloodline, but back then, it would have certainly led to problems.