Tinder has been called the harbinger of the hookup-fueled "dating apocalypse." But the truth of the matter is, hooking up isn't anything new (and may in fact be hardwired into our genetics).
You see, such images are mostly posted to get you to sign up and then after that, you will be in. If you are smart, you will want to look beyond the images and the great sounding profiles.
While it might be tricky to get any email replies without signing up, just wait until AFF sends you discount coupons, then use one of those for a short stint to exchange contact information.