Journal of Sex & Marital Therapy, 35:86–105, 2009 Copyright © Taylor & Francis Group, LLC ISSN: 0092-623X print / 1521-0715 online DOI: 10.1080/00926230802712293 Prevalence and Determinants of Male Sexual Dysfunctions During First Intercourse PEKKA SANTTILA, N. KENNETH SANDNABBA, AND PATRICK JERN Center of Excellence in Behaviour Genetics, Department of Psychology, ˚ Abo Akademi University, Turku, Finland We explored the balance of genetic and environmental factors on sexual dysfunctions during first intercourse experience in young men. Gender role conflict theory predicts that young males should show high levels of such dysfunctions coupled with mixed affec- tive reactions. Three thousand one hundred eighty six male twins and their siblings (M = 26.17 years, SD = 4.77) completed items on erectile dysfunction (ED), premature ejaculation (PE), contex- tual factors, and affective reactions during first intercourse, as well as parental attitudes towards nudity and sexuality. Twin model- ing revealed a significant genetic effects for PE, but not for ED. Experiences of sexual dysfunction and both negative and positive affects during first intercourse were common among the partic- ipants. More positive parental attitudes were associated with less dysfunction and more positive affect during first intercourse. Hav- ing the first sexual intercourse with an unknown partner and while strongly intoxicated were, together with group pressure and reluc- tance to engage in intercourse, related to more negative and less positive affects. Erectile dysfunction during the first intercourse was related to more negative and less positive affects. Gender role conflict has been defined as a psychological state in which socialized gender roles have negative consequences for a person (O’Neil, 1990). It occurs when rigid, sexist, or restrictive gender roles result in per- sonal restriction and devaluation. A young male’s first experience of inter- course is loaded with expectations and anxieties. Even though it presents an This research was financed by grant no. 210298 from the Academy of Finland and a Center of Excellence Grant from the Stiftelsen f¨ or ˚ Abo Akademi Foundation grant no. 21/22/05. Address correspondence to Pekka Santtila, Center of Excellence in Behaviour Genetics, Psychology, ˚ Abo Akademi University, 20500 Turku, Finland. E-mail: pekka.santtila@abo.fi 86 Downloaded By: [Santtila, Pekka] At: 06:11 6 March 2009