by 
Max Power
ANSWERS: 1
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It comes from the farming days where it was first noticed that both the male and the female genders in a given mammal species have teats but only one of them produces the milk required to nuture the young. For example, the teats on a cow are useful, but the teats on a bull are not. This gave rise to the derogatory slogan "He's as useless as teats on a bull," which eventually was shortened to "Useless Tit."
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