I've seen friends naked, and they were HOT and one of them had a particularly big dick, and he also has a killer body, I thought I'd fall over when I saw him naked for the first time but I didn't feel anything down there, first he's a friend, yeah I've fantasized with friends, maybe because I'm a bit needy when it comes to romantic relationships, so I feed off other people's relationships and I sorta feel a bit happy when they are nice to me, or at least nicer than usual... but they are still friends, I guess it would be weird.
Maybe I'm more controlled when it comes to getting erections in public, that never happened to me.