She said: "Dating is always a difficult thing. And to tell you the truth, I'm so dim that I don't notice when a guy is coming on to me anyway. Subtlety absolutely doesn't work with me - you have to be extremely blunt."
Despite her problems with men, the 22-year-old actress has been dating her 'Pride and Prejudice' co-star Rupert Friend for over a year.
Although the relationship is getting serious, Keira insists she has no plans to marry Rupert any time soon.
She said: "I don't want to get married in the foreseeable future. I've been married five times in films, had three children and countless proposals, so I think that's about enough really."
Despite her anti-wedding stance, Keira admits she is a sucker for big romantic gestures.
She said: "I think everybody likes a bit of romance, don't they? I go for simple things - flowers and chocolates, that does it for me. Maybe diamonds one day, but flowers and chocolates will suffice for the moment."