Introduction A number of different theoretical approaches to understanding the etiology of ejaculatory dysfunction have been proposed, but no behavior genetic study has yet, to our knowledge, been conducted to explore the genetic and environmental influences on ejaculatory dysfunction. Aim The aim of the present study was to explore the genetic and environmental effects on premature (PE) and delayed (DE) ejaculation in a population-based sample. Methods The genetic and environmental influences on PE and DE were investigated in a population-based sample of 1,196 Finnish male twins, age 33–43 years, with 91 identical and 110 complete twin pairs. Several different aspects of ejaculatory function were measured by a self-report questionnaire (e.g., latency time, subjective experience of ejaculatory control). Factor analyses distinguished two subcomponents of ejaculatory function, and subsequently, composite variables measuring PE and DE were created. Structural equation modeling was performed on the composite variables. Main Outcome Measures Measurement of genetic and environmental effects on PE and DE. Results The results suggested moderate genetic influence (28%) on PE, but not on DE (0%). There was a moderate familial effect on DE with shared environmental effects accounting for 24% of the variance. However, omission of the shared environmental component did not directly result in a significantly decreased model fit for DE, and omission of the additive genetic component did not directly result in a significantly decreased fit for the PE model. Conclusions The findings from the present study provide useful information regarding the etiology and understanding of ejaculatory dysfunction.

OBJECTIVE. Body image and perceived attractiveness were examined, and the impact of age, gender, and body mass index (BMI) was analyzed and discussed from an evolutionary and a sociocultural perspective. METHOD. The population-based sample consisted of 11,468 Finnish men and women aged 18 to 49 years. RESULTS. Both age-related decrease and increase in body satisfaction was detected as well as interactions between age and gender. Some effects were nonlinear. Women were generally less satisfied with their bodies than men. BMI had a stronger influence on women's body image than men's. DISCUSSION. It was proposed that it is insufficient to merely study how age affects general body image because adults might become more satisfied with some aspects of their bodies as a function of age and less satisfied with other aspects. Body satisfaction might also fluctuate during different phases of the adult life, and the patterns possibly differ between men and women.

The association between disordered eating and gender identity was examined in a sample of 20 (11 female-to-male, 9 male-to-female) transgender Finnish adults, aged 21-62 years. Using semi-structured interviews, participants' own understanding of the underlying causes of their disordered eating was analyzed, as well as the effect of gender reassignment on eating behaviors and cognitions. A majority of the participants reported current or past disordered eating. Participants most frequently described strive for thinness as an attempt to suppress features of one's biological gender, or accentuate features of one's desired gender. Gender reassignment was primarily perceived as alleviating symptoms of disordered eating.

Associations between number of children, pregnancy, and overall relationship satisfaction were explored in a population-based sample of 2081 women, aged 33-43 years. Multiparous women had less orgasm problems compared to nulliparous women. Nulliparous women had more pain problems and were sexually less satisfied compared to women with children, regardless of the number. Women pregnant with the first child had fewer pain problems compared to a matched nonpregnant control and were sexually more satisfied. Being more satisfied with the overall relationship was related to higher sexual satisfaction and less sexual function problems.

The relation between gender identity and body dissatisfaction as well as disordered eating was examined in a population-based sample of Finnish adults aged 18 to 44 years (N=1,142). Participants with a conflicted gender identity were compared to controls matched on age and biological sex. Participants with a conflicted gender identity showed higher levels of body dissatisfaction, women with a conflicted gender identity also showed more eating disturbance than controls. Among men with a conflicted gender identity, male-male sexual experience was associated with more body dissatisfaction and disordered eating. Among women with a conflicted gender identity, female-female sexual experience was related to less body dissatisfaction. Possible explanations for these findings and the potential clinical implications are discussed.