Alcohol consumption and risky sexual behaviours: consistent patterns in France and South Korea

Abstract Background Despite the concurrent increase in harmful alcohol use and risky sexual behaviours associated with STIs and HIV/AIDS among young adults, their relationship remains inconsistent due to the inherent influence of sociodemographic and cultural factors on drinking and sexual practices. This study aims to examine the relationship between alcohol consumption and risky sexual behaviours and cross-validate this relationship in France and South Korea. Methods We conducted a cross-sectional survey among young adults aged 18 to 30 in France and in South Korea in 2023-2024 (n = 998; 489 in France, 509 in Korea). A spearman partial correlation and a z-test on Fisher-transformed correlation coefficients were used to determine the relationship between alcohol use and risky sexual behaviours, as well as the consistency of this relationship across both samples. Results After controlling for age, gender, occupation, education, and perceived socioeconomic status, a positive correlation was found between the age of alcohol initiation and the age at first sexual intercourse in both samples (r=.17 in France, r=.28 in Korea; p < 0.001). Alcohol Use Disorder Identification Test (AUDIT) score and the frequency of drunkenness showed positive correlations with the number of sexual partners (r=.19, r=.26 in France; r=.19, r=.23 in Korea; p < 0.001). These two alcohol use indicators were also correlated with the frequency of inconsistent condom use (r=.15, r=.12 in France; r=.06, r=.14 in Korea; p < 0.001). The Z test confirmed that there is no significant difference in all correlation coefficients between the French and Korean samples. (p > 0.05, 95% CI). Conclusions An integrated health intervention aimed at simultaneously addressing harmful alcohol use and risky sexual behaviours is warranted to prevent high prevalence of sexually transmitted infections among young adults. Key messages • Recent data support that alcohol use is associated with risky sexual behaviours among young adults. • This relationship is consistent regardless of different sociodemographic and cultural settings.