Is it OK for a happily married women to have male friends?

I recently saw a movie called Life in a Metro, which had a very interesting storyline. A married woman whose marital life has gone a little bitter finds true love again in form of a friend who travels with her in train everyday. They have a few common interests and enjoy being together. Thought she feels guilty at making a male friend and enjoying his company, she can’t stop herself from indulging in this little pleasure that relives her of her everyday life pressure. They first take this as a harmless, platonic friendship but then as their friendship blossoms and they build trust in each other, they find that what they share is more than friendship.

Thus, when it is said that a man and woman can’t be ‘just’ friends, it is right to quite an extent. Usually, when a girl meets a guy and finds him worthy of her friendship, they exchange their contact information and stay in touch. Over a period of time, they interact, get to know each others likes and dislikes. If they still happen to like each other and appreciate some aspect of each other's personalities, they try and stay in touch constantly. This strengthens their friendship and helps in building trust. If this couple happens to be unmarried, things are simple, they have the freedom to carry their friendship to the next level and fall in love.

On the other hand, if they are already engaged or married, things take a different turn. If one or both of them are in unpleasant relationships already, this pushes them to rethink about their current relationship and give in to the temptation of taking the new relationship to the next level. This was also seen in the movie Kabhi Alvida Na Kehna. Both Rani and SRK are seen to put an end to their marriage and marry each other. Whereas, if they are in a healthy and happy relationship with their spouse, they can remain good friends and also be faithful to their partners.

This is what I think, what do you think?