Crappy screencap from a Tom Hiddlestone and Robert Downey Junior interview:
They sit like that for about a minute, but they have their hands on or around each other for the whole interview. My favourite moment is at 3:01 when RDJ goes to remove his hand from the back of Tom's chair, and Tom sort of protests. It's adorable and strange! (Okay, not that strange... dudes have figured out how to play to their audience)
Also, I never realized how much Tom Hiddlestone superficially resembles Jude Law until I saw RDJ flirt with him in a video.
Click to view
From this
video.