Shia LeBouf isn't the first do do this as performance art, it was done by the amazing Mairina Abramovic in the 70's
To test the limits of the relationship between performer and audience, Abramovi? developed one of her most challenging (and best-known) performances. She assigned a passive role to herself, with the public being the force which would act on her. Abramovi? placed on a table 72 objects that people were allowed to use (a sign informed them) in any way that they chose. Some of these were objects that could give pleasure, while others could be wielded to inflict pain, or to harm her. Among them were a rose, a feather, honey, a whip, olive oil, scissors, a scalpel, a gun and a single bullet. For six hours the artist allowed the audience members to manipulate her body and actions.
"Initially, members of the audience reacted with caution and modesty, but as time passed (and the artist remained passive) people began to act more aggressively. As Abramovi? described it later: “What I learned was that... if you leave it up to the audience, they can kill you.” ... “I felt really violated: they cut up my clothes, stuck rose thorns in my stomach, one person aimed the gun at my head, and another took it away. It created an aggressive atmosphere. After exactly 6 hours, as planned, I stood up and started walking toward the audience. Everyone ran away, to escape an actual confrontation"
From a (relatively) informed point of view and as a woman I do feel that if as an artist you chose to create a piece where you are inviting people to 'do what they want to you' then as part of your preparation for the work you are going to have to consider that someone might do something very awful, including causing your death. It is then your decision as to whether you wish to proceed, generally performance artists are used to taking huge risks with their body, it goes with the territory.
This is no way conflicts with a woman (or man's) absolute right to say no in real life, but this isn't real life, it's a performance, no performer creates work like this without both themselves and many other people, (you cannot undertake work like this without an extensive health and safety review) dissecting the risks to the nth degree.