The structure of social relationships was studied in three groups of stumptail macaques: two groups consisted of macaques of different sexes and one group consisted of males only. In the all-male group, as compared to the groups with different sexes, the social hierarchy was less strict and the social status and resulting grooming depended to a great extent on the age. The attractiveness of individuals as objects was the most variable aspect of grooming. The attractiveness increased with age, while individual preferences were less distinct.