And what if I was born male but I identify as a girl who identifies as a guy ? <| sep |> That may require a bit of custom coding . I had a membership site that was based on Wordpress , but had a member support system and membership features that weren ' t tied to Wordpress . Member support was on a separate subdomain , the membership features were in a subfolder on the main Wordpress site . Wordpress has its own database , and I created a second database that controlled access and stored info pertaining to the nonWordpress member usage . It ' s kind of complicated , but when the user logged into Wordpress , the landing page checked the member credentials , and if they weren ' t in the second system second database , they were added . Additionally , a cookie was set that gave them access to all of the other areas without logging in . I wrote the membership functions and the support system , so tying it altogether was easy . This is how I approached tying a nonWordpress system into Wordpress ' user authentication a separate database and cookies . As for authenticating users amongst multiple Wordpress instances , this plugin looks like it might workmultisitesso