Originally Posted by Mihx

Gotta agree with that one - even if I could rightfully be accused for being biased .

If you're planning on doing actual reviews rather than merely site descriptions (and oddly enough that's actually the word you chose to use in your request), you really need to sample the actual content so you can get a look at video quality, photo sizes and quality, download/streaming methods - and lest I forget the most important thing , whether the content is actually any good (entertaining, hot, fitting the niche etc.).

I'm also not entirely sure I would really expect a whole lot of sponsors to throw around free logins until you've got an established site with at least a few handfuls of reviews and indications that it's not just a temporary throw away project (not suggesting that yours will be of course, just commenting generally).
I started out paying for all my memberships back in 2005, and I've done that all along with the majority of the sites I review - some months because I don't get enough requests, others because I simply had my eyes on specific sites I wanted to review (and personally I've never liked asking for free logins - either they come to me with requests or I'll just pay like a regular member, but I'll leave that decision up to you of course).