Downey Jr: I have 'great chemistry' with Law

The actors Robert Downey Jr and Jude Law - who star as Detective Sherlock Holmes and his sidekick Watson in director Guy Ritchie's forthcoming adaptation - have formed an instant bond, according to the 'Iron Man' star.

Following Rachel McAdams' comment that the movie's primary love story would be between the two detectives, Robert said: "It's called circumstantial homosexuality."

He added: "Before Jude said he was going to do the movie, before he said that he was available, before he said that he either did or didn't want to be courted, we just started talking like two serious actors about what would need to happen to make this work as a piece of straight drama.

"We just became really close, really quickly, because we just rolled up our sleeves and started working from jump."

Robert said he loved working on the film as the cast and director had lots of fun doing it.

He explained: "I've been around and Guy Ritchie really knows how to tell a story. He's done complex storytelling very well, and he's got a great visual sense. I think that between that stuff and Jude Law and I really, really becoming very close-knit in our preparation for this, we've got Rachel McAdams playing the diva adventuress. We just had a great cast and we had a fantastic time shooting it.