 In response to Anderson, Hallie Liberto distinguishes three ways of alienating a right or good. First, one can waive a right to x (in a weak sense) by granting someone access to x with the understanding that, at any moment, permission to use x can be revoked. Second, one can waive a right to x (in a strong sense) by granting someone access to x for a duration of time, with the understanding that permission to use x cannot be revoked during this period (presumably if other terms of the lease are met). Third, one can relinquish a right to x by transferring that right, as through a sale or gift. In this case, permission to use x is granted permanently and cannot be revoked if other terms of the transfer are met. Liberto points out that those who consider the marketing of sexual services a legitimate form of work assume that the sex worker, like other workers, will only be alienating her right of control over her body and sexual labor in a weak sense (Liberto 2009: 141–43; see also Schwarzenbach 1991: 112). In a society in which any form of forced labor is prohibited (e.g., slavery, indentured servitude), workers are generally permitted to back out of labor contracts, although in doing so they typically relinquish all expected benefits (Shrage 2016).