"Disturbing because, in at least one citation I read, the language is loaded toward "heterosexual=normative; homosexual=deviation."" This is due to the use of scientific language; normal is defined as the most commonly occurring type, and other characteristics/behaviour are abnormal or deviate from the norm. There is no moral connotation, it's just an expression of frequency of occurrence. It's interesting that there is a correlation between handedness and orientation. I would have thought that the motor control centres would develop separately. Your blog sounds interesting, I'm looking forward to reading it.