After the click on the button "I Agree", the program jumps to the page it was directed to, so If you start the browser directely to this page, it will keep redirecting to this page. The normal is from the category list page or browse pages, when user clicks on the category marked as Adult, it will be redirected to the verification page then once he agrees it will be followed to the previous page.
Again, do not access the adult verification page directely.