>>2287709/cm/ is looser than /c/ in terms of what can be posted. Moderate yaoi is definitely allowed there. I'd link you to it if it didn't 404 from inactivity but /cm/ often has "hard" threads where people post naked guys manhandling each other.
The big boundary between hard /cm/ and soft /y/ is whether they're having sex with each other or not. Visible dicks, assholes, and penetration is absolutely /y/ only, but if two guys are implied to be fucking, giving blowjobs, or using dildos and something's in the way or it cuts off like
>>2286761>>2286760>>2286779>>2286781>>2286778It's also safer to post it on /y/. There is a gray area for stuff like pic related, but stuff where they have their pants on and you can't see any boners is definitely /cm/ acceptable.