Unrealistic/ridiculous things in Yaoi/Shonen ai Mangas

We fujoshis and fudanshis love BL a lot. But we also know that Yaoi can be unbelievable at times lol. What are some of the unrealistic or ridiculous things you've seen in mangas? I'll start with an example.
- 'kissing on the lips' is like 'a common greeting in western countries' XD