The growing of muscles actually, sometimes the left muscle don't grow that much as the right, so that eventually your dick bends too the left. I don't think it's genetic.
True.
I also think that when ur starting to jerk off, in a certain way, in your younger years, that it also grows like the way u jerk off.
Maybe they should start investigate this;
do the boys their dick, that are lefthanded, point right?
do the boys their dick, that are righthanded, point left?
I'm righthanded and my dick pionts a little bit to the left (when hard).