It is the common event that a husband's sweetheart is exposed by checking the sender of received e-mails.
If a female who sends e-mail to him more frequently than any other sender, the femail should be regarded as his sweetheart.
But, when we apply its rule to me, my sweetheart would be a fake female.
In fact, it is a wife in my part-time job that I text e-mail to most frequently.
So, the rule won't be applied to men who is alone.
