Upskirting is where a guy sneaks up on a woman and catches a quick pic up her skirt so he sees her panties, or if he’s really lucky, she won’t be wearing any. In the days before digital camera and cameras in cell phones, guys at dances would put little mirrors on the tips of their shoes hoping to also catch such clandestine glimpses of panties and pussies, though how they could avoid women seeing said mirrors is beyond me, no clue how they wouldn’t be easily seen.
Some men love to stand around stair cases and look up, or escalators in malls hoping for such visuals. Two states have made it illegal to take such pictures, with fines and jail time resulting. Many guys will always want to see what they shouldn’t, whether it’s spying on women in restrooms, or change rooms, locker rooms, ones will always be trying to catch such stolen glimpses, but being a peeping Tom has its consequences. There are whole sites online dedicated to posting such pics and videos, and you are not even safe at the grocery store from guys coming up behind you and shoving a camera phone up your dress.
So I guess the answer is either to wear pants, or skirts down to your ankles, then you need not worry, but most women will have to keep their guard up around them and be vigilant about what’s going on in their area. It’s one step away from groping someone and invading their personal space. Some will always push the limits.