It seems that the later children of big families, i.e. the 4th or 5th born or whatever of 5 children, have a greater tendency to be gay. This suggests a hormonal influence on homosexuality.
This is wholly different from there being a genetic component to being gay, which is not a factor. If it was, 'gayness' would be inheritable.
As for trauma as a factor... well, 
maybe in isolated cases.
http://en.wikipedia.org/wiki/Fratern...al_orientation
Bogaert, Anthony; Ray Blanchard, Lesley Crothswait (October 2007). "Interaction of Birth Order, Handedness, and Sexual Orientation in the Kinsey Interview Data". Behavioral Neuroscience 121 (5): 845–853.
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