Sexual selection in natural populations acts on highly heritable traits and tends to be relatively strong, implicating sexual selection as a causal agent in many phenotypic radiations. Sexual selection appears to be ineffectual in promoting phenotypic divergence among contemporary natural populations, however, and there is little evidence from artificial selection experiments that sexual fitnes...

OBJECTIVE Many studies have showed that excess or lack of sexual hormones, such as prolactin and testosterone, induced the sexual dysfunction in humans. Little, however, is known about the role of sexual hormones showing normal range in, especially, the basal state unexposed to any sexual stimulation. We hypothesized sexual hormones in the basal state may affect sexual behavior. METHODS We in...

Physiological responses to sexual stimuli may contribute to the increased rate of sexual problems seen in women with childhood sexual abuse (CSA) histories. We compared two physiological stress responses as predictors of sexual function and satisfaction, sympathetic nervous system (SNS) activation and cortisol in women with (CSA, N = 136) and without CSA histories (NSA, N = 102). In CSA survivo...

Although recent research suggests that individual cognitive behavioral therapy (CBT) may be an effective treatment for female sexual dysfunctions, we have little information regarding predictors of treatment response. The goal of the current study was to assess the degree to which pre-treatment relationship satisfaction predicted treatment response to cognitive behavioral sex therapy. Women wit...

OBJECTIVES Sexually transmitted infections and unwanted pregnancies occur at high rates among youth. Understanding sexual behaviour is essential for planning and implementing future effective preventive interventions. The present study examines the sexual behaviour in the general Danish population aged 15-29 years using the core indicators recommended by the European Centre for Disease Preventi...

Previous research suggests that women's genital arousal is an automatic response to sexual stimuli, whereas men's genital arousal is dependent upon stimulus features specific to their sexual interests. In this study, we tested the hypothesis that a nonhuman sexual stimulus would elicit a genital response in women but not in men. Eighteen heterosexual women and 18 heterosexual men viewed seven s...

SHIRAI, M., NAKAMURA, M. and MATSUDA, S. Differential Diagnosis between Functional and Organic Impotence by Radioisotope Penogram Following Visual Sexual Stimulation. Tohoku J. exp. Med., 1973, 111 (2), 187-195 The radioisotope penogram, which measures changes of blood flow through the penis, was developed and applied as a measure of objective differentiation between functional and organic impo...