Ashton Kutcher lets his friends steer his career as he relies on them to tell him the truth about his movie roles.

The actor admits he doesn't pay much attention to box office figures or praise from studio bosses, and instead asks his pals to let him know whether he has done a good job.

He tells America's Esquire magazine, "I know exactly what films I've done that f**king suck donkey (sic), and I know the ones that are good. I know it not because of the box office, because the box office is not going to tell you the truth -

"I know it because I have friends that don't hold back. They don't depend on me for money or employment.

"They're just friends.Friends tell the truth...You have to surround yourself with brutally honest people who will be like, 'Dude, you suck at this.

"Stop.' I know who these people are in my life. Partners, friends, co-workers.

"You have a movie and you show it to them, and if it sucks you want them to be like, 'Dude, that kind of b**ws.'"