I can think of a number of reasons why people might have more than one email address and most of them are legitimate, but I've often wondered how many people really do have them. They are easy to get and can be useful as an alternative in case of a spam attack.

However, some people use the "other" account as a secret, especially from their spouse or partner.

According to a survey from BullGuard, looked into the "secret"eamil accounts and found that 1 out of 5 men had them. Primarily to get mail that their significant other wouldn't see. Most of these accounts had passwords entry.

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[The Daily Mail]