The specific incident and stream is mentioned in comment #2607820.
That particular vtuber was already known for expressing disapproval of pornographic art of herself while retweeting a sexy (non-pornographic) image of herself (comment #2607521). Some people thought it was hypocritical (it actually isn't if you pay attention to the nuance), so when it sounded to them like she was having sex on stream, it likely brought more attention than it normally would.
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