Lots of studies have shown that girls that happen to have received prenatal male hormones show strong preferences for more typically boy's toys and play behavio

Lots of studies have shown that girls that happen to have received prenatal male hormones show strong preferences for more typically boy's toys and play behavior in spite of any degree of social pressure. There are lots more but here are a few: https://www.ncbi.nlm.nih.gov/pubmed/12760514 https://www.ncbi.nlm.nih.gov/pubmed/12760514 https://www.ncbi.nlm.nih.gov/pubmed/15693771 https://www.ncbi.nlm.nih.gov/pubmed/15693771 https://www.ncbi.nlm.nih.gov/pubmed/12414881 https://www.ncbi.nlm.nih.gov/pubmed/12414881