Robert Pattinson once got caught up in a 'dogging' ''raid.''

The unassuming actor told of his embarrassment when police intervention made him realise a public place he was stopping at on his bike was being used by men to meet up for casual sexual encounters.

He explained to talk show host Jimmy Kimmel: ''I used to turn up at this parking lot looking at everyone like, 'Why are all these guys sitting around in their cars all the time?'

''And I'm going there everyday kinda thinking nothing of it, coming out in my little Lycra pants, and one day there was a big raid.''

The 26-year-old actor also squirmed with embarrassment as he discussed a scene in his new film 'Cosmopolis' where he had to undergo a prostate exam, admitting he couldn't hide his feelings.

Asked if he was ''upset'' during the scene, he replied: ''Someone was telling me about this vein that comes out of my forehead that only ever happens when very good things happen or very, very bad things. And I have no idea which one it's Classified as, being f**ked.''

Robert - who has split from his 'Twilight' co-star Kristen Stewart in the wake of her being caught cheating on him with 'Snow White and the Huntsman' director Rupert Sanders - also joked he has been homeless after moving out of the home they were sharing together.

He said: ''I am [homeless]. No, I rented this archway and I just live behind it. In one of those trash cans.''