I think... She needs to start talking to her partner instead of going off words and "advice" from people who's either not in their relationship or a complete stranger. She needs to go and speak to him, and ask him what's he comfortable with, and what he's willing to try, or what he absolutely does not want to try. He did the right thing by opting out of what they're doing. Because it's only going to get toxic.
I think... She needs to start talking to her partner instead of going off words and "advice" from people who's either not in their relationship or a complete stranger. She needs to go and speak to him, and ask him what's he comfortable with, and what he's willing to try, or what he absolutely does not want to try. He did the right thing by opting out of what they're doing. Because it's only going to get toxic.