updated 09/11/2009 AT 9:00 AM ET
•originally published 09/11/2009 AT 11:45 AM ET
In her new horror film Jennifer’s Body, Megan Fox plays a possessed high schooler who eats any male classmate who gets in her way. In real life, the star says, she’s not that ferocious with her men – but they had better mind their manners.
“I don’t like boys who are mean to their mommies,” the star, 23, told PEOPLE at her film’s premiere at the Toronto International Film Festival Thursday. “That’s a real turn off for me. And I don’t like boys who aren’t chivalrous. To me, not being respectful is a big deal.”