When everyone is gay in a story. Its fine if you have 2 couples or sort but then you see everyone is gay for each other and thats really unrealistic (which make it a yaoi i guess) i will read it later tho lol.
I really hate it when they start having sex in a really inappropriate location without thinking about it, like the mangaka just started with the sex scene and forgot where they were/what they were doing before. Like for example: The hallway in school? Or like in one manga the dude was sitting in the classroom and some guy looked out the window and ......
When the Uke is so fucking feminine that it be looking like a rare pokemon. Like what guy are you looking at to draw this character??? Huge ass eyes, skinny af, short af, etc. I like uniqueness in my yaoi. Ya feel? Some manly uke and shit makes things interesting. I also don't like that rape shit. Also, threesomes with twins just weird as fuck man.......
What stuff in yaoi turnes you off?