Answering your questions:
Yes.
Maybe my spouse isn't interested in doing those things? There are various activities that my fiance would rather sit at home than doing.
Same things I normally would talk to anyone about. Food, music, or movies mostly. I'm not interested in baseball, but do most of my sports talking on the internet anyways.
Could you be more specific?
What sort of things do you like doing with another woman that your wife isn't interested in?
Also, is your wife interested in food, music, or movies?
Mostly meaning "new" women, as there does seem to be a difference in forming new close relationships with women after marriage, and maintaining old ones.