I think the reason that women are more emotionally involved with someone with whom they are cheating is because they would not risk their marriage for the sake of meaningless sex.

I feel it is one of the fundamental differences between men and women and it becomes a stumbling block for many couples:

If a husband has a one night stand, he sees it as meaningless and sees that it does not affect his feelings for his wife, while his wife feels is devastated that he would risk their whole life together for the sake of one meaningless night with someone else. She feels that means their relationship is worthless.

On the other hand, a woman who has a long term affair, feels that it is not as bad as having a one nighter, while her husband finds that far more hurtful as he can't just put it down to a momentary lapse in self control.

Just another of my many theories, feel free to disagree with me as much as you like!

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