well there has been red flags for years
a couple of years ago he did that chair-room thing, where he sat in a room with a paper bag over his head - and then people could come in and do whatever. It was his "I am sorry" art exhibit.
Supposedly one of the people who came in to say, a woman, stripped him naked and whipped him (not sure with what) and then fucked him.
...that he didn't tell her to stop . well... recently we have seen him go to great lengths for his 'art'