Everyone has their own mental turn-ons.
Think about it. As you developed in your own sexuality, male or female, gay or straight, or somewhere in between- you learned what worked for you, and you reinforced that by plenty of experiences that were rewarded with lots of orgasms- either by yourself, or with others.
The palette of turn-ons is as wide as the spectrum of human personality. If we were all alike, the world would be a rather black and white place. Fortunately, it's not. Some guys apparently feel more comfortable trying to say that they live in that grey world, and they can't see or appreciate that others around them are dipping into a whole wide array of paint cans.
If you are one of those 100% guys, please don't think that others are being offensive when you are doubted when you say that you don't love dick. Do you find your own body revolting? Do you enjoy physically stimulating yourself, and using it to bring pleasure to others (women or men?) A healthy association with your own gender would make it possible for you to honestly say that you think a penis (even your own) is pretty damn cool.
Sexual behavior is a visual turn on to most men- and whether it be straight, lesbian, gay or bi porn, it's usually gonna get the blood flowing. Either you want to participate in the scene, or you want to take a stab (pun intended) at using one of the available holes. Part of the identification is hoping that the cock is big and swollen and ready to go to work- and straight porn is all about the money shot.
Guys who are here "just for the conversation"... hmmm. If you're not here to look at pictures, then why would you be interested in a site like LPSG when guys are talking cock? If you're not here to look, then maybe you're here to post images yourself and get a little bit of admiration from others... all while being repulsed by your own junk? It just doesn't make sense.
I'm attracted to some pussy, and some cock. Not all. For me, it goes beyond just the genitals. If I connect with a guy and I find him interesting and the attraction is mutual, then I make a decision on whether I want to do more with him. If I am with a woman and she is emotionally emasculating or just not an attractive soul, that's it and I don't have any interest in visiting her kitty cat AT ALL.
No shame in the cock, men. It's not just gay guys who know that- and I've learned from some of my close friends, both gay and straight, to be a better man and to embrace my own sexuality and my own pleasure, and not be wrapped up in labels or expectations.