If this becomes law it won't matter. Your whole work force is now gay. Don't believe me? Try to terminate some one and you will discover that they are gay. They've just been in the closet until now but you've forced their hand.
You prove they are not gay. How are you going to do that?
There may be a sudden rise in "accidental" death among workers. When it comes to their livelihood folks can become very inventive.