I wonder what rupert grint has to say about this?

Yeah. Naked. So that must have been weird

Yes... sort of. They kissed in a hallucination Ron was having under the influence of one of the horcruxes. I'm not sure if they actually did though, it might have been implied... it's been a while since I've seen it.

I think I remember clearly. It was kinda a wild kiss... ohh

They actually had to drag Rupert off the set for that scene cause he was laughing so much

Of course they did. He is a bit of a nut after all. This is the same guy that bought an ice cream truck with his movie money.
Not that that's a bad thing...

How many times did they had to do it??

Yeah, I was watching an interview with Emma and she sad that she was topless and they were covered in silver bodypaint and they had like a full-on makeout session. It was just Ron's worst nightmare though.