https://classypornvideos.com/ is the site to save you searching
first thing - lose that over the top 'how old are you page' Not only is it redundant, it told me off for putting just 2 digits for my year of birth ! it's obvious we are talking about '19'xx as if it was 20xx I couldn't have been born yet.
Sure, if you really want a 'Click here if over 18 page, then knock yourself out - your site, your rules. But if I wasn't going in to look as a professional, i wouldn't have wasted so long, solving a 'age form' puzzle.