Emotional cheating vs Physical cheating..the lesser of two evils?

So which is worse and why? Does physical cheating usually end up becoming emotional or vice versa? No, I am not thinking about cheating I am just curious as to what everyone thinks. Cheating is cheating and it is wrong but I am just curious...
Update: Emotional cheating (for those of you that aren't sure) is when you turn to another person (not your spouse) for emotional support. Physical cheating is doing anything sexual with someone other then your partner.
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