Originally Posted by amateurcanada

This is tricky, theoretically they trademarked YOUPORN itself - so you would need to do a trademark search to see if its that phrase exclusively, or that phrase and similarities. They may have registered trademarks for some deviations. They may have only registered this trademark in the USA only. Its a worldwide market - if your overseas and its a USA trademark then you can do whatever you want.

Hope this helps.