If a guy browse and save photos of sexy, pretty girls is this still normal or does it mean anything?

I know its very common for guys/men browsing through pages, websites or photos of sexy women/ladies/girls, but what I don't get is downloading and saving those stuff.. For what? My boyfriend does this.. And what upsets me most is that there are photos of my friends too! I understand him watching those kind of pics (most men do this) but is there any explanation why SAVES it too, in his phone? And my friends'? he's actually hiding these stuffs, but I figured out the pw of the files and found those.. Guys, does this mean anything?

My boyfriend and I are OK. I know how much he loves me and told me once he's only up to looking at those, nothing else bec I'm the only one he loves, but what about with my friends photos? Its kinda disturbing. I mean we meet with them once in a while.. Urggh, help clear out my mind and doubts.
If a guy browse and save photos of sexy, pretty girls is this still normal or does it mean anything?
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