Just to follow up on this can of worms, my daughter the amateur psychologist tells me that Clark Jr. wouldn't be attracted to Lois because our minds automatically reject potential pairings with people that we grew up with. It usually applies to siblings (i.e. if Lois and Clark had been raised as siblings they wouldn't be attracted to each other), but I guess it would work with parents, too. And Clark Jr. is not Clark, Sr. any more than any pair of identical twins are the same person. Genetics is only part of what makes us who we are--Clark is Clark partly because he was raised by Martha and Jonathan, or, in this Clark's case, by an orphanage started by them. But that's a whole nother topic.
