I know a bunch of gay couples with kids. None of the kids are gay. If it's a learned behavior, the kids are slow learners.
Most people don't subscribe to that "learned behavior" theory any more. I really doubt that the Cheneys, Keyes, or Randall Terry families taught their children homosexuality.
Homosexual activity IS a behavior - a non-procreative disordered behavior that ANYONE can choose to engage in one time or many times.
Re: "None of the kids are gay" -what exactly does this mean? How did you verify this?