The problem is that you are automatically a criminal. If you do anything to protect yourself you'll find yourself in federal prison. From the below article, their attitude is "Once you cross that line, I can do whatever I want."
Penn Jillette (of Penn & Teller) was groped a few years ago, I like how he handled it.
If some guy copped a feel on me and I kicked him in the groin, I'd like to see the cop or security person who'd arrest me since I'm 5 feet tall and petite. I also have that innocent look too. I'm saying this somewhat tongue in cheek but I honestly would take that chance. Either that or I'd be screaming at the top of my lungs and by that time, if my husband were there... well, he's Sicilian, need I say more?
BTW, thanks for that link. I forgot to say that.