I agree it is common. I think EA and online affairs can be considered grey areas, where everyone's boundaries are going to vary according to the context. Whereas a physical affair most of us would agree is absolutely an affair and totally unacceptable.
I wonder how many people on TAM are open with their partners that they go to a forum to discuss the details of their relationships. How would it make them feel if they read some of the things we discuss on here? How would they feel if friendships have developed here, either in public or in private messaging? Because I see this ALL the time.
Most regular posters seem to be here most days - philosophically speaking - is it possible that we are all having one big collective emotional affair?
(I'm teasing - a little).