Watching a dude jack it to estimate size has nothing to do with one's sexual orientation. A dick is a dick. A woman being in the scene doesn't validate your heterosexuality. Looking at a big dick is looking at a big dick. What makes you gay or bi is if you want to interact with it. I've looked at a few JO vids a few times in the past to compare. Does that make me want to suck one, or get a male lover? LOL. All men have a dick. We all compare. The means by which we do it has nothing to do with our sexual orientation. It's a competitive thing, not a "I want you baby" kind-of-a-thing." Look at males in the wild when the fight for mating purposes. They urinate on each other, etc. Men, by nature, look to dick other men down. The gay thing should never come into play.
Any dude that comes close to a true 8 inches or around that is very, very rare (when measured properly). 9, 10, etc. is when a bigger boy is measuring very improperly.
