Biology and sexual orientation INAH3 weight for the heterosexual male brains was significantly larger than for the heterosexual female brains, while the results for the gay male group were between those of the other two groups but not quite significantly different from either. The neuron count also found a male-female difference in INAH3, but found no trend related to sexual orientation. A 2010 study, Garcia-Falgueras and Swaab asserted that "the fetal brain develops during the intrauterine period in the male direction through a direct action of testosterone on the developing nerve cells, or in the female direction through the absence of this hormone surge.
Causes of sexual violence do non-rapists. In one study, male rapists evaluated with penile plethysmography demonstrated more arousal to forced sex and less discrimination between forced and consensual sex than non-rapist control subjects, though both groups responded more strongly to consensual sex scenarios. Data on sexually violent individuals show that most direct their acts at individuals whom they already know. Drug-facilitated sexual assault (DFSA), also known as predator rape, is a sexual assault carried out after the victim has become incapacitated due to having consumed alcoholic beverages or other drugs. Alcohol has been shown to play a disinhibiting role in certain types of sexual