Gay fetish encompasses a whole lot of niches and sub niches. Is there a specific fetish you or your models are thinking about creating? Will this be content you want to sell to other site owners, or is it for a site you're thinking of putting together?

Fetish needs a passionate approach (you're into it yourself), and a cameraman who has a clue about it to make the sex videos believable for your consumer. Just saying "such and such really sells" doesn't mean YOU will do well with it.