Looking at cock may not be gay. But trying not to look at cock is definitely considered straight.
Yes, men look "straighter" when they turn away from looking at the very organ they all have between their legs. But they can watch those big dicks in porn with their buddies for hours on end (It's all about the girl, you know). Go figure!
If you have a penis, and you're not gay, why would you be so scared to view the organ you yourself possess? It's not as if most straight men act indifferently towards other men's penises.
It all makes me wonder...