I'm a materialist and an atheist. Being an atheist doesn't prevent me from seeing how abusive and immoral it is to purchase someone's body from a position of economic and social advantage. In fact, it clarifies the situation greatly; there is no soul separate from the body, so making someone's body the object of economic exchange is literally always participating in human trafficking.

The authors at http://www.feministcurrent.com/?s=prostitution would universally guffaw at your misdirection towards religion. This is about patriarchal oppression of women, all gussied up in the same neoliberal language that has proven itself unmeritorious in other public spheres.