Ishtar was the Akkadian goddess of fertility and sexuality. Her temples often maintained sacred prostitutes that provided a lucrative source of income.
They often advertised their services by means of erotic hymns which would be chanted at the entrance to the temple to entice passers-by.
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Source: https://books.google.co.uk/books?id=spJbp4bu9lIC&pg=PA87&lpg=PA87&dq=ishtar+will+not+tire+full+text&source=bl&ots=Du_6qaGAOU&sig=YHPrdZiwKdLl4iuOJ2LLo1nw2V8&hl=en&sa=X&ved=0CCEQ6AEwAGoVChMIktKamc6mxwIVJSvbCh056AOk#v=onepage&q&f=false
More information about sacred prostitutes in the ancient Near East: http://www.academia.edu/2360254/Temple_Sacred_Prostitution_in_Ancient_Mesopotamia_Revisited