Adolescent Sexual Debut and Initiation into New-Type Drug Use among a Sample of Young Adults

Early sexual initiation and risky sexual practices among alcohol- and tobacco-using young adults in Taiwan: mediation analysis of preceding-sex use of illicit drugs

BACKGROUND

As early sexual initiation is increasingly common in East Asia, we examined its relations to risky sexual practices in alcohol- and tobacco-using individuals in Taiwan and evaluated whether the associations were mediated through preceding-sex use of illicit drugs.

METHODS

Participants, recruited from alcohol- and tobacco-using adults aged 18 to 50 in Taipei through respondent-driven sampling (N = 1115), completed a computer-assisted self-interview covering questions on substance use and sexual experiences. In a subsample of 916 participants who had had sexual experience (median age 27), we examined the relations of early sexual initiation (< 16 years) to multiple sexual partners, casual sex, group sex, and rare condom use. Causal mediation analyses were conducted to examine whether illicit drug use preceding sex mediated these associations.

RESULTS

Around 9.3% reported early sexual initiation and the prevalence of risky sexual practices ranged from 7% (group sex) to 47% (rare condom use). Early initiators had a higher prevalence of regular binge drinking, illicit drug use, and risky sexual practices. In the multivariable analyses, higher odds of multiple sexual partners, casual sex, and group sex were consistently associated with early sexual initiation, gender, and their interaction. Mediation through preceding-sex use of illicit drugs was found between early sexual initiation and the three risky sexual practices, with the proportions mediated ranging from 17 to 19%.

CONCLUSIONS

Early sexual initiators were more likely to engage in risky sexual practices and preceding-sex use of illicit drugs partially explained this relationship, calling for more attention to this population's sexual health.

Factors Associated with Sexual Debut in Mexican Adolescents: Results of the National Survey on Drug Use among Students in 2014

INTRODUCTION

Although first sexual experience (understood as first sexual intercourse) is one of the most commonly assessed characteristics of adolescents, recent research emphasizes the importance of understanding other related social factors. This study highlights factors associated with first sexual experience in a nationally representative sample of adolescent students in Mexico.

AIMS

The goals of this study were (i) to determine the proportion of adolescents aged 12-17 who had had their first sexual experience; (ii) to identify the factors associated with first sexual experience; and (iii) to analyze the conditions (condom use, substance use) in which first sexual experience takes place.

METHOD

The data presented in this study are drawn from the 2014 National Survey on Drug Use in Students (Spanish acronym ENCODE), undertaken with the purpose of identifying the prevalence of drug use and associated variables, including sexual activity, in Mexican students. Kaplan-Meier analysis was used to estimate the probability of first sexual experience at a given age, taking sex as an outcome variable and age as a follow-up period. Logistic regression was used to assess possible factors for sexual initiation.

MAIN OUTCOME MEASURES

Validated standard questionnaires were used to assess sociodemographic characteristics, first sexual experience (framed as first sexual intercourse), frequency of sexual relations, sexual partners, sexual preference (framed as preferred sex of partners), substance use, having a physical illness or a behavioral problem, condom or other contraceptive use, as well as the absence or presence of parents, parents' educational attainment, and parents' substance use.

RESULTS

A total of 26,187 students aged 12-17 participated. Of this total, 14.8% had already had their first sexual experience, at a median age of 15; 64.5% used some type of contraceptive, and 53.2% used condoms. Proportional probabilities for having first sexual experience using age as a follow-up period showed that the probability of having sex earlier was higher among boys than girls: the probability of having sex at age of 15 was 26.5% for boys and 13.9% for girls. Predictors of first sexual experience included substance use (alcohol OR = 2.5, tobacco OR = 2.6, and other drugs OR = 2.3), having a mother who used drugs (OR= 2.2), sexual preference (female homosexual, OR = 2.2), and sex (male, OR = 2.1).

CONCLUSIONS

Boys are more likely to have had a first sexual experience than girls. Future strategies should incorporate specifically targeted elements with different messages that consider adolescents' sex and age. Barragán V, Berenzon S, Tiburcio M, et al. Factors Associated with Sexual Debut in Mexican Adolescents: Results of the National Survey on Drug Use among Students in 2014. J Sex Med 2019;16:418-426.