One study found a rise in testosterone levels prior to a contest among men, but not women (29). In contrast, another study suggested a link between testosterone and externalizing behavior in male adolescents, but not females. One study conducted among female adolescents has suggested that high levels of testosterone may predict conduct disorder (17). Among violent men, however, testosterone levels had a positive and significant association with hostility (7). Thus, more research is needed to understand the role of sex as a possible moderator for the association between testosterone and violent behaviors. Although sex and gender have been suggested as possible moderators of the link between testosterone and aggression, most studies have focused exclusively on males (14, 15).
In addition to neutering, it’s crucial to address the underlying causes of mounting behavior and provide alternative outlets for the dog’s energy and instincts. However, it’s essential to note that mounting can also be a learned behavior, and neutering may not completely eliminate the behavior if it has become a habit. Neutering can be an effective way to reduce or eliminate mounting behavior in dogs, particularly if the behavior is driven by testosterone. However, it’s not uncommon for the full effects of neutering to take up to six months or even a year to become apparent.
The relationship between testosterone and aggression is complex and multifaceted, influenced by a range of biological, environmental, and developmental factors. Environmental factors, such as stress and social status, can significantly impact the testosterone-aggression relationship. The relationship between testosterone and aggression is not uniform and is influenced by a variety of factors, including genetic predispositions, environmental factors, and developmental considerations. Lastly, clarifying the role of testosterone in aggression can help dispel myths and misconceptions surrounding the hormone's effects on behavior. The knowledge gained from this exploration may pave the way for innovative interventions or treatments targeting aggressive behaviors.
The article concludes with a summary of key findings, implications for health psychology, and avenues for future research, providing a nuanced understanding of the complex interconnection between testosterone and aggressive behavior. In crickets, sticklebacks, and mice, selective breeding for high or low levels of aggression in males produces a marked and rapid response, indicating that at least some of the original variation in aggressiveness in the parental population is the result of genetic differences. Genetic factors on the Y chromosome of mice determine whether the embryonic gonad secretes androgens and hence whether aggression-promoting brain regions are sensitized to testosterone. The example of differential exposure to hormones in mouse embryos illustrates a point that is true for all behavioral traits—i.e., that aggression develops as a result of interaction between genes and the environment in which the genes are expressed. Conversely, female embryos situated between two males experience relatively high androgen levels and become particularly aggressive to males when treated with testosterone as adults.
A lack of correlation between circulating T and aggression may also occur if individuals vary in other mechanistic steps on the pathway between T and behavior. For instance, T levels measured following a standardized injection of gonadotropin-releasing hormone (GnRH; i.e., a "GnRH challenge") are highly repeatable within individuals, at least within the same reproductive stage (Jawor et al. 2006). For one, hormones influence many different components of the phenotype, including behavior, via step-wise or other non-linear effects (Hews and Moore 1997; Adkins-Regan 2005). Some of these studies have found significant positive correlations between baseline T and aggression among individuals (Harding 1983; Geniole et al. 2020).

Gender: Female

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