> There are probably a large number of the 6 billion alive that were the result of rape in their lineage, even within the past 8-10 generations.

Didn't the world population exceed 7 billion some years ago?

And I just googled and found a recent Reddit thread of which the OP had a similar thought to yours. Interesting.

http://www.reddit.com/r/Showerthoughts/comments/2i25ol/do_i_...