It's because lesbians are mostly in it for the romantic aspects of a relationship and can use tools for sex or create their own ideas of how to fuck. My ex and I fucked constantly but there's this thing called lesbian bed death where they just don't have sex and it's so common they think it's ok. I see these fat "queer" girls or any "queer" girl on tumblr that wants to look like they belong to a minority and think "yeah but would you eat pussy?".