I can understand voyeurism but have to say that as with all things on the Internet it’s possible to take things too far. And of course the extremes of porn on the Internet are very extreme.
You see my take on the up-skirts panty shot is that it’s the surreptitious flash of what’s hiding up there that is the turn on. The glimpse of something that would normally be hidden. It’s the same with a flash of stocking or the inadvertent opening of a blouse as a woman leans forward. There’s infinitely more eroticism in that than a girl wearing stockings with legs akimbo with no preamble or a woman taking off her blouse and scooping her tits out with no self-consciousness.
Some things like that are difficult to quantify, but with the up-skirt picture (which I have to say have bee over-done to hell) I think there should be a minimum length for skirts. It’s easy for the photographers to get a show of a girl’s crotch if the skirt is only six inches from waistband to hemline but that has no appeal at all. I would say mid-thigh is the shortest to be properly arousing and then only with the quickest of flashes.
All that said the up-skirts panty shots always disturb me somewhat because of their implied lack of consent, even when they are obviously staged – so they aren’t something I seek out – there’s much better and more exciting stuff out there.
I’d actually much rather first feel what a woman has on under her skirt than stick my head, or a camera up there though that wouldn’t work on the Internet LOL