I just noticed a mainstream site...
http://siteanalytics.compete.com/solarenergy.com/
Notice that second SE refer? That site is getting 1/3 of all SE traffic from bing... now go to your site. Maybe it's getting ranked high on Bing... but I bet you aren't receiving that much traffic.
The reason is bing's adult content filter... just another fucked SE. Maybe bingadult.com could do something?
I don't know... just a search engine I find to knock out alot of the bigger paid companies in a search result now have crippled results to adult because of their dumb ass filter.