Tess: don't worry, I think we're all pretty chill about it. We just like to whine because we can.

Like I said, having a auto-ban on parent/child mating is sufficient to satisfy me.

Iustinus: when you said direct ancestor/descendant, you mean parent/child, right? I've seen some really crazy stories while working with indigenous languages in the Pacific Northwest (including one where this woman dies, then reincarnates as a man and has sex with his/her granddaughters O_o), but I have yet to come across anything where a parent/child relationship is condoned.