Do guys get boners when?

I’m just wondering….. do guys get boners from just LOOKING at a hot girl? Like, if they see a sexually/physically attractive girl either in real life or a photo of her, do they automatically get a boner or no? Just wondering.. because some guys told me they do when they see a hot girl in person or a photo of her or even just thinking about her turns them on easily and they get hard but I’m sure not all men are like this.

I also know guys can get them in their sleep and sometimes for no reason at all relating to a girl or anything, but this is another thing.
Is it involuntary... kind of like breathing is? I'm talking about getting boners.. and when it gets hard, does it hurt like someone is squeezing it? Or does it feel good? I heard about blue balls before
how can I make a guy get boner in class?
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  • Depends on situations

  • When I was a teen, quite often, in person. Rarely now.
    "I also know guys can get them in their sleep and sometimes for no reason at all relating to a girl or anything"
    *They happen for the unromantic reason of needing to pee. That's what morning wood is.
    "Is it involuntary... kind of like breathing is? I'm talking about getting boners"
    *There's always a reason. Visual or physical stimulation or needing to pee.
    "when it gets hard, does it hurt like someone is squeezing it? Or does it feel good?"
    *Neither. It just feels stiff.
    "I heard about blue balls before".
    *Blue balls comes from being aroused for too long without cumming. It is engorgement of the prostate gland and strain on the tubes suspending the balls, which lift up during arousal.
    "how can I make a guy get boner in class?"
    *Obviously without touching him. Give him something naughty to peek at.