National tables: age and sex. Percentages Rate of persons who have had casual partners in the last year by age group and sex. Units: percentages ;Both sexes;Males;Females; Total;17.08;25.19;8.35; From 18 to 29 years of age;25.55;36.32;13.92; From 30 to 39 years of age;14.73;22.75;5.96; From 40 to 49 years of age;10.06;15.09;4.79; Notes: 1) Rate calculated as regards the population of 18 to 49 year olds who have had sexual relationships in the last year Data corresponding to cells with less than 45,000 persons must be used with caution, because they may be affected by high sample errors. Source: National Statistics Institute