Liv Tyler is "too sensitive" for casual relationships.

The 32-year-old actress - who has a five-year-old son Milo with ex-husband Royston Langdon - has been single since splitting from the rocker in May 2008 and admits she rarely goes on dates because she worries about getting hurt.

She told Tatler magazine: "I fall in love once in a blue moon.

"I wouldn't be capable of having a casual fling. I'm far too sensitive, and I just wouldn't have any pleasure from it."

Liv has previously spoken about how separating from Royston made her feel physically ill.

She said: "There's nothing worse than heartache, being lovesick. It's like there's a physical sickness. You go through a couple of weeks where you think, 'Oh, I'm OK, I feel better,' and then suddenly, out of nowhere, it hits you again.

"The hardest part is when they leave. It also brings up a lot of issues - you might feel like a failure, or like there is something wrong with you. You can't run away from yourself - you kind of have to just deal with it."