Prohibition prevents harm by substantially curtailing markets in sex  The good of sex when offered as a gift is not the same good when it is bartered. Taking or offering money cheapens and deforms the good of sexual intimacy, which when shared with many on the open market diminishes its value. Moreover, while the benefits of commoditized sex are questionable, the harms are significant. Those who engage in such exchanges diminish their capacity for genuine sexual intimacy, while damaging their physical, emotional, and mental health. Moreover, the harms of market sexual transactions often affect non-involved third parties, such as the spouses or lovers of sellers and buyers.  Because the harms of market sex are long lasting, though sometimes distant, it is appropriate for society to intervene to prevent these harms. Markets in sex pose a public health threat, just like markets in dangerous drugs. Prohibition will reduce the number of people who engage in market sexual transactions, and for those who do participate, there are ways to minimize violations of their rights.