It's best if you imagine Twitch's latest rules update being read by a downtrodden, barely present spokesperson.
"Content on Twitch is always evolving," they mutter, unable to recall how many versions of that statement they've composed before. "And we want to make sure our rules work as intended and keep up with emerging behaviors."
The behavior that emerged this time is streaming games on butts. That is, using one's posterior like a green screen, overlaying a gameplay feed on it. (Or just pointing a camera at your butt.)
If streaming Fortnite on your butt or watching other people stream Fortnite on their butts is something you enjoy, you'd better get your butt streaming in soon, because this is one emergent behavior Twitch isn't going to let continue. On Friday, "content that focuses on intimate body parts for a prolonged period of time will not be allowed," the site announced.
Twitch has updated its sexual content guidelines with the new rule.
Source