First Sexual Intercourse in the Irish Study of Sexual Health and Relationships: Current Functioning in Relation to Age at Time of Experience and Partner Age.

The Irish Study of Sexual Health and Relationships, based on a nationally representative sample of Republic of Ireland adults in 2004-2005, was used to examine adult adjustment in individuals who had their first sexual intercourse as a minor with an adult. Participants were classified into one of four groups based on their age at first intercourse and their partner's age: minors under 18 with peers; minors under 16 with adults; minors 16 to 17 with adults; and adults with adults. Adjustment (health, general relationships, satisfaction with most recent sexual partner, self-confidence, education and career achievement, and sexual problems) was compared across groups separately by gender. The vast majority of cases involved postpubertal heterosexual coitus. Overall, minors involved with adults were not significantly less well adjusted than adults involved with other adults on a majority of measures, effect size differences in adjustment were mostly small, and mean adjustment responses consistently indicated good rather than poor adjustment. Sex differences in first-intercourse characteristics and reasons for engaging reliably occurred for all age groups. In general, males compared to females were more willing, wanted more to lose their virginity, felt more ready for it, did it more often on the spur of the moment, and were less often involved in a relationship or in love when it occurred. Sex differences were greatest for boys versus girls under 16 with adults. Mediation and moderator analyses were also performed. Results were discussed in relation to competing perspectives on the effects of minor-adult sex.