Well first and foremost, before testing any niche you HAVE to see if there is content available for it.

Ill typically hit up the Ounique and WWC sites and look through content sets and DVDs to see if there is anything usable, if i cant find at least 15 image sets and 8 DVD scenes in total i wont go any further with the idea.

Now, if i do find enough content, ill then do a quick search on Google for a bunch of related keyword phrases and look at what sites come up in the listings and what they have on them relating to the niche.

From there, its on to a domain name search.

Once i have a domain found that i like ill start with putting up a basic holding page and some SEO metas to get it listed and see how much natural traffic gets generated after 30 days.

30 days later, ill throw up a free site, tgp gallery or two and possibly a private paysite on the domain depending on how well i think the niche will work overall based on traffic, content, demand, etc, etc...

Regards,

Lee