Some people are bi+ and just aren't out yet or don't even know exactly what they are. And that's fine. I also believe it's probably a pretty small percentage of the population. Fwiw, you can be in a differing sex relationship and still be somewhat curious about the other side of the coin. I think the worst thing people can do is be ashamed of it, then hide it at all costs where it manifests as this sort of website. Instead of having conversations among friends and spouses and more healthy methods of exploring one's sexuality, such as going to pride events and making diverse, enriching friendships.