Fink, I wouldn't say its a genetic defect, but a genetic variance. Like blue eyes.
Which brings me to a question, have they found the 'gay' gene? I don't recall a news story about this, but it seems probable they will if they haven't already.
No! Studies tends to prove that's nothing to see with genetic .
You doesn't have a "gay" gene. You doesn't have an "hetero" gene neither!