> Or look at the religious rationale for prohibiting prostitution: It treats the prostitute (often a woman) as an object rather than a person with innate dignity, and even in cases where the prostitute is making a seemingly free choice to engage in the transaction, there are often hidden pressures (addiction, mental illness, a pimp) that affect her ability to make a truly free choice.

I don't know about this one. Few religions put a strong focus on gender equality. On the other hand, it is absolutely consistent with the emphasis on reproductive sex.