I would argue that stability is the key. A stable one-parent home therefore trumps (IMO) an unstable/unhappy two-parent home. But obviously the best situation is a happy 2-parent home. 
[low blow]Yeah, I'm sure those priests were trying to create children with their choir boys[/low blow] 
-Arrian

That assumes sex ought to be used for the purposes of creating children, Speer.

-Arrian
Comment