Hi again,
What plugin are you using to get the cookies file with? I recommend using Chrome, but if your using Firefox, try using this plugin:
"Export Cookies"
https://addons.mozilla.org/en-CA/firefox/addon/export-cookies-txt/
Select "All Domains" as your export option and give it a try. It works for me! I also tried "Cookies.txt" but it does not export the information correctly! (>_<); The the cookies exporter you used might not be working correctly.
Give this one a try on Chrome:
https://chrome.google.com/webstore/detail/get-cookiestxt/bgaddhkoddajcdgocldbbfl...
I know for sure it works as many people are using it. If it doesn't work for you, then there is something else going on on your end. Maybe some kind of ad or tracking blocker? Not sure!
@ trustycakes and everyone else, the "Export cookies.txt" addon on Firefox works well but you have to rename the given cookie file "r18.com-cookies.txt" as "r18.com_cookies.txt" (otherwise the program will not recognize it)