But Seriously I think its more of a cultural thing than anything. Wasn't it a custom in certain cultures where they have arranged marriages between family members? Back in the day would u really wanna send ur daughter off to marry some dude u don't know or would u feel better with her marrying someone in ur family that you know would take good care of her? So yes the PC thing to say is that Incest is bad, but would u say that if everyone was wiped out and the only chicks left to make babies were ur family, would u say well shit I ain't gonna bang u so I guess we gonna become extinct. Everything is relative, a big grey area. And if not I guess I'll have to bang ur retarded sister.