If you want to get them a referer then setup a dummy page that you don't mind them seeing you can do this but will require PHP knowledge or access to someone, i suppose I could throw something together using curl if others are interested

Your first page is when people go to from you tube, these people are redirected to your "dummy" page using CURL so you can POST a variable to the new page.

On the dummy page you want the referer to be gets the POST (say id=ok) from the other page then it will redirect to the affiliate link. If it doesn't then it just shows your dummy page with a link to the affiliate program.