I don't think that a guy who tries gay stuff can immediately be labeled bi or gay. I don't know how it is with older generations, but a lot of guys my age aren't that hung up about it. First of all, we have this whole selfie "look at me" thing going on, where people take thousands of pics of themselves including their junk. I'm not saying taking a pic of your dick is a gateway to trying gay stuff, but I'm saying that it does set us up for a general feeling of being more comfortable with our bodies. When you can pose in a mirror and take hundreds of pics at a time, you get in tune with that. And you like to look good so you work out and fuss over pubes, and all that. Secondly, we're seeing little kids coming out these days. We're just more knowledgeable now as a whole about being gay and it's more accepted. So instead of waiting until your 20's to nervously come out, we have 12 year old boys coming out. It's just a different time, and a lot of people my age are responding to all these social factors. It's no longer something you have to hide or feel ashamed about. Obviously there's still homophobia and all that, but the ones of us that are open are really open.
All this combines into some interesting things, if you ask me. I have several straight male friends who like jacking off together, for instance. And one of my roomies in college and I jerked each other off one night. To be fair, we were drunk, came back to our room, and stripped down for bed. We had jacked ourselves off together a couple times before and that night he just asked me if he could do mine. So I let him, and I jerked him off too. It wasn't because he had some big desire to be gay, and that was literally the only time that happened. He just had never experimented when he was younger, and wanted to know what it was like to yank a dude off. To hold another dick. Gay guys at college tend to give a lot of head. At least I think it's a lot. Straight guys just don't care; they can get a blowjob and go about their business without working to convince a girl or having to do anything in return. It's even admitted that the gay guys are better at sucking cock. They can walk two doors down at midnight, get a quick bj, and go to bed. It's simple. There's even been talk of straight guys giving each other oral, just because. I haven't seen it or been too privy to all that. But the rumor's out there. I don't think that means two straight roomies are 69ing every night. I just think sometimes it's like, "Fuck I need a blowjob." "Fuck so do I." And then it goes from there.
TL;DR version: I don't believe that jacking with a man makes you gay or bi. And I don't believe that getting head from a dude makes you gay or bi. I also don't believe light experimentation makes you gay or bi. Just because you've done a "bi act" once or twice in your life doesn't mean you're bisexual. Sex and sexuality are two different topics. And not everyone my age agrees with that and I know that not everyone at my college feels that way. But there are those of us who do. I just say don't label yourself too rigidly, and don't worry what society says what's gay and what's straight.