i *think* that in the bible Cain goes off to a city and marries a girl there.
From Genesis:
[5] ; if anyone kills Cain, he will suffer vengeance seven times over." Then the LORD put a mark on Cain so that no one who found him would kill him. 16 So Cain went out from the LORD's presence and lived in the land of Nod, [6] east of Eden.
17 Cain lay with his wife, and she became pregnant and gave birth to Enoch.
I'm not sure where exactly this other city is supposed to have come from since adam and eve were supposedly the first humans on earth and though they were supposed to have lived for an extremely long time (adam for 930 years!), certainly long enough for a city to rise up... but where would the people come from?
so no... i don't think incest is implies although...
i found this -- which is *really* sketchy -- apparently some people believe that cain and able each had a twin sister who married the other brother....
[url]http://judaism.about.com/library/3
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