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Let's be serious here. The BF may be something of a jerk, but his concerns are not "nuts." You just can't disconnect sex and morality, although any two people may disagree over where to draw the line.
MCBRIE- I agree with you, whether a threesome is immoral or not is a personal decision. But the fact the the boyfriend doesn't like threesomes isn't really the problem. It's that he's been upset about it for 6 months, it's effected their relationship in every way, and he refuses to do anything about it. I think that's an overreaction in this day and age, personally. If he doesn't, he needs to break up with her and let them both get on with their lives. It's nuts to continue the relationship as it is, and it's nuts for her to think that they're ever going to get past this.