Incest

[Rawedge Rim]

1. Who said that Cain and Able were Adam and Eve's first children. And as stated above, even using the bible, there were obviously other people on the earth.

2. Increased risk of deformation in close pairings with relatives, which surely turned up early in mankinds history, and probably got noticed. (Ever notice how Zong's family alway's have a lot of hare-lips and real dumbass's)

3. Robert Heinlien, in "Time Enough for Love" postulated a time where the genetic chart for anyone who wanted it could be obtained, read, and, barring any bad news within the chart, it might be "genetically" no problem with siblings having offspring with each other, while two complete strangers may be genetically mismatched, with defective recessives reinforcing each other producing bad offspring.

[Baradakas]

Interesting side note:

www.sciencedaily.com/releases/2008/02/080207140855.htm

[Blackhawk]

'Cause it's icky.

Take away the genetic issue, and it's just icky. Then there's the power and control issues associated with a parent (or older relative like an aunt or uncle) and a child.

LOL agreed

[Blackhawk]

I guess this might be due to Covenant almost hooking up with his daughter..is that why your asking? the whole rape of lena and then the weird feelings she Elena had toward TC even knowing he was her father was a little like Excalibur with Arthur and his sister,

mostly Incest was taboo because of the breeding factor and the chance of having extra teeth or psychosis or some other deformities.
so..whos your uncle...well my uncles my dad and my mom is my cousin...etc..it would get too confusing. it really would put a spin on family trees..they would look like the viancombs of revelwood LOL.