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This is really a hard one. Are you having trouble figuring out whether someone you know is bi, or whether strangers who are unusually friendly are bi?
I'm bi myself and have a hard time telling if another guy is bi. Let me rephrase that, I find it almost impossible to tell unless the other guy makes a move on me.
I have a couple of long time friends that I have suspected might be bi, but not sure. One of my friends has several times commented on guys checking him out in the locker room, told me a guy complimented him on his big cock, and one time when the conversation involved gay guys said he wasn't sure if he could suck cock. I admit I am denser than most, but I don't think most straight guys would be so unsure whether they could suck cock or not. When he makes these statements, I get the feeling he is waiting for me to respond, but I never do. He is such a good friend I don't want to jeopardize our friendship if I am misunderstanding him. His friendship is more important than sex (although I have to admit he is very hot and the thought has crossed my mind)
My other friend that I suspect might be bi (or even gay) has rarely dated or been involved with women since I have known him. What really makes me wonder is I've seen him checking out other guys all the time. I think he is really unconscious that he is doing it, because he is very conservative and wouldn't do anything like that so openly. Again, he is a great guy, and I would never do anything that would hurt our friendship.
As far as strangers go, that is even harder to figure out. I am not a very outgoing person myself, and am rather shy with strangers. When other guys are overly friendly, I assume that is just the way they are, although there are times I am probably being naive. There is a guy at my gym whose behaviour perplexes me. He is a young guy who doesn't give off any gay or bi vibes, but is VERY friendly and talkative in the locker room. He has struck up conversations with me in the locker room a few times, and I have seen him talk to other guys as well. That could just be chalked up to an outgoing personality, but the other thing he is always doing has me baffled. I have been in the shower with him a few times and he is always facing away from the wall when he showers. A couple of times I was opposite him and when I turned around to face out, he is facing me and starts soaping up his cock, and spends a long time doing it. The entire time I was facing him rinsing off my back, he had his hands on his dick washing it. He doesn't get hard, but is touching his cock the whole time. That is not typical straight behaviour. I know you need to wash everything, but most guys just face the shower and wash their privates. It was weird that both times I was opposite him in the shower he did this.
So, is this guy bi, or not? There are a lot of straight guys that are exhibitionists in the locker room, maybe that explains it, but it has me puzzled.