Oddly, the safety comes in... anonymity. You can't tell a bisexual man from a heterosexual one and most homosexual ones just by looking at them. Younger Me, after sucking off three of my friends and walking around trying to find other guys to suck off, reasoned that there can't be anything wrong with this if there are so many guys doing it both young and old. Unless you come out to one and all - and to anyone else who'd listen - no one would ever know that you're a bisexual man. Still, just because you can literally hide in plain sight, that doesn't mean that you cannot have pride in yourself.