Men do not cheat to ‘trade up’ so much as satisfy the need, which is not much different (any really) from drug addiction. Women cheat to see if they can trade up, and are willing to trade up (for financial reasons). Women are likely to forgive for financial reasons whether they love or not. Men are more likely to forgive because they love their wives (and loyalty) women are less likely to forgive because they are less likely to love their husbands (devotion), since their devotion almost entirely to their kids. (Really).