Nothing new, only the technology has changed. I had a high school teacher (45 years ago) that used to drop pencils near the desks of the good looking girls so he could get a look see.
I had a HS Coach/History teacher who arranged the desks on three walls facing inward. It was obvious what he was up to so I went to the principal. Of course, the principal did nothing.
Well I guess now I must confess, in junior high we had a really hot German teacher that wore short skirts, us guys were accidently dropping trash all the time so she would pick it up. Funny though, when my daughter was around thirteen and some pervert would start staring lewdly I had no problem confronting them in the middle of a mall. I guess unlike most of us that learn proper and improper behaviour there will always be some that need to have it beaten into them.