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Well it's certainly encyclopaedic. You could always be the bold one to add some info there, and if anyone reverts, then just discuss it. You don't ''need' a picture though, just because there's a heterosexual one there. And i doubt you would easily find one anyway.
As a coincidence i've just started a side project which is similar at User:Jenova20/List of gay sex positions...It's a very limited work atm though...
As always, let me know how things are going and good luck. Thanks 20 (email) "