I love this quote, taken from an article in my post above :
Think of his wife/her husband. Is it fair to her? She's been married to him for however many years, cleaned up after him when he's sick, raised children with him, sacrificed with him, dealt with the "damn dailies," then you come in at the 11th hour and provide a contrast to that that's new and exciting and fun. You are intruding upon her turf. You are a trespasser. It is no different than being a thief in the night. It is no different than breaking into their house and stealing their things.