A sister site to SB Nation, Outsports.com, spoke with over a dozen NFL players about homophobia in sports. It's quite an interesting article as Ahman Green talks about having two gay siblings and RG3 shares his experiences of having a gay teammate in High School:
"When he came out, he stopped playing," Griffin said. "He might have stopped playing because of the negative feedback he might have gotten from being that on the football team. So, I think that's probably why he ended up quitting."
It was from that out player that Griffin learned a gay teammate poses no threat.
"Just because they're gay doesn't mean they're hitting on you," he said.
Here's an interview with the article author and his take on talking with the NFL players: