Actually, when Mary Magdalene is introduced by Luke and Jesus casts out seven demons that plagued her, which is given as evidence of sexual misconduct and prostitution. And, Jesus's words "Her sins are many, but they are forgiven, because she loved me much" are taken to again indicate that she was known as a prostitute (her many "sins").
In fact, the practice of prostitution in biblical times went through a number of changes in acceptance and censure. You have to remember, the old temple practices that still existed while Christianity was coming into prominence were at odds with "new" thinking about the sinfullness of sex. So, you still had temple prostitutes as part of a more pagan tradition, and you had Christian thinking. Generally, even Christian thought was that prostitution was acceptable under certain circumstances. For instance, Saint Augustine was a firm believer that if you git rid of prostitution, you were putting people's souls at risk because of the central tension between the body (and lust) and the spirit; remove the sexual outlet, and uncontrolled lust would damage the soul.
That's enough thinking for one Saturday. My brain hurts.
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