The vast, vast majority. By and large, lesbians don't watch lesbian porn, not because we're like ~above that~ or some shit, but because its almost all wall to wall misogyny and fetishisation. The odd piece of content that is made for lesbians by lesbians (and you can always tell) tends to be made by independant people and hosted on smaller sites because of its apparently 'niche' audience, and so it is much more vulnerable to take downs and deletions - for instance in the tumblr purge or pornhubs recent wipe of indie stuff (although of course i do get that there were reasons for that one).