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Boys may delay their sisters from becoming women and from having sex, new findings from Australia suggest.
男孩的存在可能会推迟自己姐妹变成女人以及发生性关系的时间，澳大利亚科学家的最新研究表明。
The presence of older brothers seemed to delay the onset of menstruation of girls by nearly a year on average, and having younger brothers seemed to postpone the beginning of sexual activity in women by slightly more than a year, scientists found after interviewing 273 Australians
科学家在调查访问了273名澳大利亚人后发现，哥哥的存在会让女孩子们的月经初潮平均晚来一年，而弟弟的存在则会使女孩初次发生性行为的时间推迟一年以上。
