Part 1
I suspect, Mike, that we may differ profoundly about the probably nature of the non-genetic factors that affect our sexual orientation at puberty. 

I am convinced that we ought to understand ourselves as essentially tri-leveled creatures, biological, psychological, and spiritual; and I view our understanding of our psychological nature as in its mere infancy. Among available theoretical options, I lean strongly to the psychoanalysitic in a moderately precise, very limited sense. That is, I reject most of psychoanlalytic theory, but believe that that field has correctly identified that we have an powerful psycho-active unconscious (as well as a semi-conscious, and conscience mind). Further, I think pyschoanalysis (1) has correctly identified dream analysis as the key to efforts to try to understand our unconscious mind, and (2) has correctly understood that our unconscious mind in so much as it affects our later behaviour, is largely settled in our infancy (prior to two years).