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Daniel Radcliffe, Emma Watson and Rupert Grint became household names through their involvement with the Harry Potter franchise. Image Credit: Rex Features

Daniel Radcliffe was expecting a tender embrace when it came time to kiss co-star Emma Watson in the new Harry Potter film. What he got was torrid necking, Watson working magic with her lips "like an animal," he said.

"I thought it was going to be like a soft, sensual sort of moment, and it was this very vigorous kissing scene," said Radcliffe.

"She really went for it, I have to say. It caught me slightly off guard, but yeah, I'm not complaining. Many men would lose a limb to be in that position, so I was absolutely fine with it," Radcliffe said.

The film casts Harry and best pals Hermione Granger (Watson) and Ron Weasley (Rupert Grint) out into the world to fend for themselves, and the journey puts severe strain on their friendship.

Under the spell of an artifact containing part of evil nemesis Voldemort's soul, Ron is sent into a jealous rage by a vision of Hermione, the girl he loves, and Harry taunting him as a third wheel in their relationship. Hermione and Harry then turn to each other and do some kissing that looks positively bestial.

"I guess I just realised that I would have fewer takes to do if I just got on with it and just gave David what he wanted, which was a passionate kiss. Which was something that would really rock Ron's boat and really be quite painful and nasty for him to watch," Watson said.

"When they were there actually filming that kiss, they did actually want me there to kind of play off something, but I just found that too funny," Grint said. "Emma sent me out because I kept laughing. It just looked really strange."