As a cashier, how can you tell when a customer of the opposite sex is seducing you in to fall in love with them?

As a cashier, how can you tell when a customer of the opposite sex is seducing you (or at least attempting to seduce you) in to fall in love with them? What are some ways that you know of that fall in the line of a seductive male or female customer when being temped as a cashier?
As a cashier, how can you tell when a customer of the opposite sex is seducing you in to fall in love with them?
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