Pornography and sexual experiences among high school students in Sweden.

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Abstract

The study investigated the differences between high school boys and girls in: (1) the use of pornography, (2) sexual experiences, (3) experience of sexual abuse, and (4) perceptions of sexuality and pornography. It also examined the possible predictors of experiencing sexual activities, such as sex, sociodemographic factors (high school program, household, and ethnic background), pornography consumption, experience of sexual abuse, perception of sexuality, and perception of pornography.

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Sexual dimorphism of brain developmental trajectories during childhood and adolescence.

Rhoshel K. Lenroot, Nitin Gogtay, Deanna Greenstein … (2007)

Human total brain size is consistently reported to be approximately 8-10% larger in males, although consensus on regionally specific differences is weak. Here, in the largest longitudinal pediatric neuroimaging study reported to date (829 scans from 387 subjects, ages 3 to 27 years), we demonstrate the importance of examining size-by-age trajectories of brain development rather than group averages across broad age ranges when assessing sexual dimorphism. Using magnetic resonance imaging (MRI) we found robust male/female differences in the shapes of trajectories with total cerebral volume peaking at age 10.5 in females and 14.5 in males. White matter increases throughout this 24-year period with males having a steeper rate of increase during adolescence. Both cortical and subcortical gray matter trajectories follow an inverted U shaped path with peak sizes 1 to 2 years earlier in females. These sexually dimorphic trajectories confirm the importance of longitudinal data in studies of brain development and underline the need to consider sex matching in studies of brain development.

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Gender differences in erotic plasticity: the female sex drive as socially flexible and responsive.

Roy Baumeister (2000)

Responding to controversies about the balance between nature and culture in determining human sexuality, the author proposes that the female sex drive is more malleable than the male in response to sociocultural and situational factors. A large assortment of evidence supports 3 predictions based on the hypothesis of female erotic plasticity: (a) Individual women will exhibit more variation across time than men in sexual behavior, (b) female sexuality will exhibit larger effects than male in response to most specific sociocultural variables, and (c) sexual attitude-behavior consistency will be lower for women than men. Several possible explanations for female erotic plasticity are reviewed, including adaptation to superior male political and physical power, the centrality of female change (from no to yes) as a prerequisite for intercourse, and the idea that women have a milder sex drive than men.