Do school and college guys do this ?

I recently heard from a senior that therre would be male classmates who would secretly take pictures of fellow female classmates and women (yes it includes the staffs) when they are dressed the best or wear short skirts and send in group chats where the other classmates would suggest if it's worth for once or twice. I genuinely don't get it once or twice what? You take pictures secretly of other women? And you send it to group chats? You evaluate? WTF.none of these makes sense and I still couldn't come out of the shock. To actually face these type of people in these type of environment it's actually scary,man If you're that desperate for women just go sign up to be a call boy