Guys, why do guys like other girls pics on Facebook or instagram? ... Even when they have a girlfriend... What does this mean.. When a guy does this?

Why guys do this all the time
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Does it mean he is fantasizing about her... Because he likes girls pics.. Selfie pics.. Fitness pixs... Her bum pics etc.. U get the idea...
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Also.. He keeps liking this one girls pic... Most of the time... Is it bc... It appears on his page or what else could b the reason that he keeps checkin her page and liking her pics? ...
Guys, why do guys like other girls pics on Facebook or instagram? ... Even when they have a girlfriend... What does this mean.. When a guy does this?
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