The Way Boys Play and the Biological Underpinnings

Here's an article by Moiret Allegiere on this topic that is worth reading:
https://moiretallegiere.wordpress.com/2018/11/21/let-boys-play/

Tom's book on amazon:
http://www.amazon.com/Helping-Mothers-Closer-Their-Sons/dp/096546492X

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2583786/
Hassett JM, Siebert ER, Wallen K. Sex differences in rhesus monkey toy preferences parallel those of children. Horm. Behav. 2008;51:359–364. [PMC free article] [PubMed]

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4350266/
Hines, M., Constantinescu, M., & Spencer, D. (2015). Early androgen exposure and human gender development. Biology of sex differences, 6, 3. doi:10.1186/s13293-015-0022-1
Early androgen exposure and human gender development

Lamminmaki A, Hines M, Kuiri-Hanninen T, Kilpelainen L, Dunkel L, Sankilampi U. Testosterone measured in infancy predicts subsequent sex-typed behavior in boys and in girls. Horm Behav. 2012;61:611–6. doi: 10.1016/j.yhbeh.2012.02.013. [PubMed] [CrossRef]

Pasterski VL, Hindmarsh P, Geffner M, Brook C, Brain C, Hines M. Increased aggression and activity level in 3- to 11-year-old girls with congenital adrenal hyperplasia (CAH) Horm Behav. 2007;52:368–74. doi:

Hines M, Kaufman FR. Androgen and the development of human sex-typical behavior - rough-and-tumble play and sex of preferred playmates in children with congenital adrenal-hyperplasia (CAH) Child Development. 1994;65:1042–1053. [PubMed]

17. Savin-Williams, Ritch C. Adolescence: An Ethological Perspective. New York: Springer-Verlag, 1987. Print.

18. Maccoby, Eleanor E., and Carol Nagy Jacklin. "Gender Segregation in Childhood." Advances in Child Development and Behavior Advances in Child Development and Behavior 20 (1987): 239-87. Web.

19. Geary, David C. Male, Female: The Evolution of Human Sex Differences. Washington, DC: American Psychological Association, 2010. 322. Print.

20. Hassrick, Royal B., Cile M. Bach, and Dorothy Maxwell. The Sioux: Life and Customs of a Warrior Society. Norman, OK: University of Oklahoma, 1964. Print.

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