This discussion reminds me of when I first learned that one of my co-workers was JW. We had been hanging out together socially for about a year and a half before she very reluctantly confessed her religion. She had just started dating one of my best friends when she confided over coffee that his Roman Catholic religion was a problem for her. When I asked her why, she told me his family had a problem with her religion. When I asked her what religion was, she replied that she was Christian. I told her "Christian" was a generic term and asked her to be more specific. Again she said she was Christian. I continued to press her. Finally, with her eyes to the floor, she said she was JW.
As it turned out, she had fewer problems dealing with a Catholic family than she did with her own congregation. She and my friend took great pains to hide their relationship from everyone except their immediate families and closest friends until they announced their engagement so she wouldn't get into any trouble with the elders. She once laughingly told me a story about how she dealt with a "sister" she and my friend ran into at a popular restaurant. She told the sister she was having lunch with a business client!
Since she and my friend are now married and she is still "in" the organization, I agree with the posters who say that a JW dating or marrying a non-JW is not a disfellowshipping offense. However, from talking with both of them, I think dealing with the issues involved puts a lot of needless stress on a relationship.
Iz