[Raven]

Of course. A "gay" gene would only cause you to react to same sex pheromones in the way most would react to opposite sex pheromones, this is simple a hypothesis don't assume it as fact. As such human beings generally cover up pheromones with deoderants and such. Thus the pheromones would have no effect or a lessened effect. Thus requiring a psycological mindset towards such activities.