I don't know why...only a hunch or a gut feeling, I get the impression HKS might be a closet gay OR a 'non-performer'. (My opinion only)
Non-performer might be more like it....what would make someone like that feel more like a real man? Having ANS as a trophy.
It might just be me but I also get the impression that he was somewhat jealous of Anna's fame for what it was worth.
I am certainly not up to date on this story.
Did you see this?
http://www.tmz.com/2007/01/23/anna-nicole-to-birkhead-go-f-k-yourself/