Objective: Paternity is uncertain, so if paternal feelings evolved to promote fitness, we might expect them to vary in response to variables indicative of paternity probability. We therefore hypothesized that the risk of lapses of paternal affection, including abusive assaults on children, will be exacerbated by cues of non-paternity. Methods:…

Objective: Substitute fathers are often reported to commit child abuse at higher rates than birth (i.e., putative genetic) fathers. Due to the paucity of studies, especially in developing countries, and to some conflicting results from developed countries regarding the identity of perpetrators of less extreme forms of physical abuse of children in…

Obtained data from 16,117 high school students in 15 Brazilian cities concerning participation in extracurricular activities and consumption of drugs and alcohol. In majority of cases, no association was found between attendance of artistic-, community-, or sports-related activities and substance use. Weak but constant negative association was…