"Class-structured homosexuality appears with the dawn of economic stratification. Here the two partners are drawn from different economic strata or classes, the wealthier partner purchasing or commanding the sexual services of the poorer. The partners may differ in age, gender, or preference for particular types of contact, but these differences do not define the relationship. What does is the preference of the wealthier partner. Thus Captain Blight, visiting Tahiti in the late eighteenth century, observed a chief sucking the penis of his attendant. By the usual conventions linking rank and sex role, this transaction should not have occurred. The attendant should have been sucking the chief. However, the chief occupied a social position that enabled him to gratify his personal preference irrespective of conventions about homosexual roles. In societies were social relations are commercialized wealth bestows sexual power. Two forms of homosexuality are particularly common in antiquity: prostitution and intercourse with slaves."