From WENN.com

The Harry Potter star portrays late gay poet Allen Ginsberg in the upcoming biopic, and had to strip down for a sex scene with another man. He also makes out with his co-star Dane DeHaan.

But as a heterosexual, the 23 year old needed some guidance and he turned to Krokidas for tips and demonstrations.

The moviemaker tells the Associated Press, ""Radcliffe simply asked, 'John, you're gay. How does this work?' I'm not kidding. And so perhaps there was a little dry run-through... with me and the director of photography Reed Morano.

""I might have done it on purpose to make everyone laugh, too, but I also wanted to make sure that we got it right.

""Other films that have depicted certain moments of sexuality like this, it doesn't happen that way. And at least for cinematic history, I wanted to get that moment right. But Dan watched, observed, found his own connection like he did any other scene and dove right into it.""