I'm 18, and I'm a little behind in the puberty range, if you know what I mean...everything else is normal, but I haven't started shaving yet, and have very little body hair, other than pubic hair. I've never had a girlfriend, or been on a date for that matter (paethetic, huh?)
Anyway, I'm not sure what my orientation is. I usually j/o to guys, mostly shirtless guys. I don't feel an emotional feeling, but more of a sexual feeling. I'm not sure if this is because I actually am attracted to that, or if it's because I'm jealous of what they have, since I'm rather on the skinny side.
I'm also attracted to women, but more on an emotional level. I feel emotionally attracted, but am rarely sexually arroused by a woman.
So, what do you think I am? gay? straight? bi?
Also, is it normal for me to really enjoy being shirtless? I especially love being shirtless in public, and when people see me without a shirt on, even though my body is rather skinny, I'm not that much to look at.
In the meantime, being physically attracted to shirtless guys is normal, especially if you feel sexy or sexual feelings when you are shirtless. Also, if you're attracted to other good looking guys, there's also a jaleous passion component to consider. It's normal for a male to be attracted to another male who he wants to look like or might be a little jealous of.
Anyway, I wouldn't let our society's fear, hatred and homophobia make you worry about your sexual orientation. In fact, there are plenty of straight men who find the male body quite attractive physically. (See jackinworld.com) It's perfectly normal. Forget sexual classification, and follow your heart, that's what matters the most.
As far as jacking off to shirtless guys is concerned, you may want to start focusing on yourself instead, so that you can see that you are good looking and attractive to the opposite sex. Just fantasize how a woman might be attracted to you the way you are attracted to those shirtless guys.