Why do men look at women's profiles on social media?

My boyfriend keep searching/visiting female profiles on his Facebook. Some searches are men profiles, but a lot are females. Some are his female colleagues, some are just random women, but I've noticed he has searched some girls multiple times. Why would he be doing this? Is it curiosity or does he find them attractive? I've asked him about it and he denies looking at different profiles, but I've seen it.
Why do men look at women's profiles on social media?
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