Being friends with her and not telling her he's really Superman been shagging her brains out by night until she decides to hunt him down? Definitely bad. Or at least devious. But in a good way :D

People are straight, sometimes. Shocking, I know :P
You could always make someone else bi. Maybe one of the evil co-workers.

Of course. *grins* That does make moar sense than the flamingoes. Sidekicks are fun.