Twitch Updated their Sexual Content Policy:
- Changes: Certain content now allowed with labels
- Artistic Nudity: Permitted under Sexual Themes Label
- Game Nudity: Contextual; labels necessary
- Body Painting: Acceptable with appropriate label
- Mature Games: Label generally covers content
- Stream Visibility: Impacted by content labels
- Twerking, grinding and pole dancing are now allowed without a label.
That’s why it’s legal, it became a first amendment issue.