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Genetics, along with hormones and upbringing, may play a part in sexuality, according to a study。 一项研究显示，除了荷尔蒙和教育方式外，基因也会对性取向产生影响。 Researchers claim it is known that there are well-established traits which differ between girls and boys, with, for example, boys more likely to engage in 'rough and tumble' play。 研究人员称，众所周知女孩和男孩的特质之间存在着根深蒂固的区别，比如男孩更喜欢打闹。 | 
