With my previous (incorrect) knowledge, attempting to influence someone's sexuality had no redeeming features. Its only effect was to create confusion, self loathing and other negative effects/emotions in adolescents. If, however it can be effected by the environment then there exist situations, possibly controllable situations where children can be systematically influenced to one sexuality or other.

My immediate reaction is that people should still be able to figure it out for themselves, but the situation is less black and white than before. If for example gays turn out to be significantly happier and more productive throughout their life than straight people, does it then become moral to attempt to influence potential homosexuals to increase their changes of becoming gay? The opposite argument also exists if you replace gay with straight in the previous sentence. It is no longer an open and shut case, there exist worlds where the optimal thing to do is morally repugnant to me. It pits my value for autonomy against my value of optimality.