Our scenario starts with birth. What this means is that a youngster without these traits will be somewhat less likely to become homosexual later than someone with them. Perhaps he is more interested in art or in reading - simply because he's smart. Or perhaps his father really disliked and rejected his son's sensitivity. We may contrast this to the boy whose loving father dies, for instance, but who is less vulnerable to later homosexuality.
Complementary dynamics involving the boy's mother are also likely to have played an important role.
I never got along well with the boys my age and felt more comfortable around girls. Early on, he develops intense, nonsexual attachments to older boys he admires - but at a distance, repeating with them the same experience of longing and unavailability. He begins to develop homosexual crushes. I was never interested in girls. Psychotherapeutic intervention at this point and earlier can be successful in preventing the development of later homosexuality.