An old post by Dr. Anthony Esolen has been brought up by The Thinking Housewife, Ten Arguments for Sanity, 7-8, in which he speculates on the origins of male SSA. A reader at the Thinking Housewife and the proprietrix of the blog are somewhat skeptical, but I think what Dr. Esolen has written is echoed by various [Catholic] psychologists writing about the genesis of SSA (for example, this).

I'd have to double-check what is written in The Battle for Normality and The Truth about Homosexuality.