any REALLY successful solo-site girl will know about her site
relatives & friends will come across her samples on the tgps
the obscure & average girls can probably get away with this...but as the solo-site operator you're looking for special girls to be "stars" - (although i see many a site launched just to jump on the solo-girl site bandwagon, not necessarily to have an internet starlet)
i think its much better to be upfront & honest with your intentions...lay it out very clearly what you want to do and what you expect of the girl, if she gets scared then forget her and find a new one, there's thousands of hot girls turning 18 every day - it's our job to find them
...you dont want "average" girls you want stars, that's the whole point of a solo-site. if you want to keep it hidden you might as well have her be content of a multi-model site