Keeping your sexual orientation secret in the workplace is easy enough if you just take simple measures like requiring all your employees to refer to their lovers only in gender-neutral terms and to use gender-ambiguous pronouns when talking about eir partners, and firing anyone who drops gender-revealing names (People dating 'Sam' are fine, people dating 'Deekoo' are not). At most non-porn jobs, your sexual orientation is not going to be relevant to your job performance.
When it comes to games, this sort of thing is *not reasonable*. Most mmog players are doing it *for fun* and don't want to have to use the genderless pronouns they use at work. And they're doing it *for fun*. Why should people have to keep their orientation secret *while playing a game*?