I am not sure about how networks feel about commenting etc, and I don't run any adult sites myself, but the best way I've had sites rank for keywords I wanted was too submit articles, setup web2.0 sites and provide content on my site with keywords as the anchor text etc. Obviously I can see that article sites might not appreciate you linking to a hardcore site and this would depend on the exact content of yoru site. Are you looking to rank for keywords in the SERPs to get traffic, or? Other than putting links on your site to others, what do you currently do?
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