Why do guys get aroused/turned on by photos?

Anonymous
I'm wondering because I have a friend who found 3 inappropriate accounts pretending to be her and using her photos. Guys literally send these accounts videos of themselves masturbating to her face and I was shocked and felt sorry for her. I just don't get this because I could never get aroused by a photo and I don't see why guys get so turned on just from a photo of a girl's face or body. Why do men get so aroused from them?
Why do guys get aroused/turned on by photos?
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