If you go to hotmovies.com you will see the number 1 search term is cuckold.
That is out of literally hundreds of different search terms and niches.
It has been the number 1 search term for several years and will most likely stay the # 1 search term for some time
Oh and in case I did not mention it happens to be my niche
have a closer look here...
http://saraswirls.com
visit my affiliate page to get an idea and a sense on how well my content appeals to cuckold fans