Gyllenhaal says he understood the universal aspects of the relationship, despite his friends' reactions.
"They're all like, 'Dude, you're gonna kiss a guy'," he said in a recent interview.
"But it's not about that for me. It's about how impossible love can be sometimes and I can relate to that," he added.
"As well as that, every man goes through a period of thinking they're attracted to another guy."
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