I don't know if you want to know for aesthetics or wondering if it effects retention? I used to keep numbers on every little thing like this and colors of join links on tours and whatnot just so I could eek a half a % out for people. I haven't done that type of tracking in some time now, but I can tell you that - for whatever reason - dark backgrounds had a plus over light ones on sites that were more hardcore or fetish oriented and the opposite held true for sites with more of a glam style type content.
For what it's worth anyway...
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Retired Pornosticator
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