“Reacher” star Alan Ritchson looks like he can pull a guy’s head off with his bare hands.  But that doesn’t make him impervious to sexual assault.

Before his acting career took off, Ritchson was working as a model.  One day his agent set him up to do a nude shoot with a, quote, “very famous photographer.”

The deal was that if he did the nudes, the photographer would set him up with a “very lucrative” campaign for a magazine and a clothing line.

But without giving any details, he says the guy sexually assaulted him.  So he left and went straight to his agent’s office to complain.  He says the agent gave him a “coy smile,” meaning he KNEW what he was sending Alan into.

He quit that agency, and modeling altogether.  He says, quote, “There are very few redeeming qualities to working in that industry.  Let’s be honest, it’s like legalized sex trafficking.”